Bug fixes, CLI updates, docs.

frontends/cli/main.py

@@ -6,6 +6,7 @@ CHANGES in v3.2.0:
 - Removed date dependency from all operations
 - Renamed day_phrase → passphrase
 - No longer need to specify or remember encoding dates
+- Default passphrase length increased to 4 words
 
 Usage:
     stegasoo generate [OPTIONS]
@@ -28,26 +29,57 @@ sys.path.insert(0, str(Path(__file__).parent.parent.parent / 'src'))
 
 import stegasoo
 from stegasoo import (
-    encode, encode_file, decode,
+    # Core operations
+    encode, decode,
+    
+    # Credential generation
     generate_credentials,
-    export_rsa_key_pem, load_rsa_key,
+    generate_passphrase,
-    validate_image, calculate_capacity,
+    generate_pin,
-    parse_date_from_filename,  # Keep for filename parsing only
+    export_rsa_key_pem, 
-    __version__,
+    load_rsa_key,
-    StegasooError, DecryptionError, ExtractionError,
+    
-    FilePayload,
+    # Validation
-    will_fit,
+    validate_image,
-    strip_image_metadata,
+    
-    # Embedding modes
+    # Image utilities
-    EMBED_MODE_LSB,
+    get_image_info,
-    EMBED_MODE_DCT,
+    compare_capacity,
-    EMBED_MODE_AUTO,
+    
+    # Steganography functions
     has_dct_support,
     compare_modes,
     will_fit_by_mode,
-    calculate_capacity_by_mode,
+    
+    # Utilities  
+    generate_filename,
+    
+    # Version
+    __version__,
+    
+    # Exceptions
+    StegasooError, 
+    DecryptionError, 
+    ExtractionError,
+    
+    # Models
+    FilePayload,
+    
+    # Constants
+    EMBED_MODE_LSB,
+    EMBED_MODE_DCT,
+    EMBED_MODE_AUTO,
+    DEFAULT_PASSPHRASE_WORDS,
+    DEFAULT_PIN_LENGTH,
 )
 
+# Optional: strip_image_metadata from utils
+try:
+    from stegasoo.utils import strip_image_metadata
+    HAS_STRIP_METADATA = True
+except ImportError:
+    HAS_STRIP_METADATA = False
+
 # QR Code utilities
 try:
     from stegasoo.qr_utils import (
@@ -87,6 +119,7 @@ def cli():
     Version 3.2.0 Changes:
     - No more date parameters - encode/decode anytime!
     - Simplified passphrase (no daily rotation)
+    - Default passphrase increased to 4 words
     - True asynchronous communications
     
     \b
@@ -109,9 +142,12 @@ def cli():
 @cli.command()
 @click.option('--pin/--no-pin', default=True, help='Generate a PIN (default: yes)')
 @click.option('--rsa/--no-rsa', default=False, help='Generate an RSA key')
-@click.option('--pin-length', type=click.IntRange(6, 9), default=6, help='PIN length (6-9)')
+@click.option('--pin-length', type=click.IntRange(6, 9), default=DEFAULT_PIN_LENGTH, 
-@click.option('--rsa-bits', type=click.Choice(['2048', '3072', '4096']), default='2048', help='RSA key size')
+              help=f'PIN length (6-9, default: {DEFAULT_PIN_LENGTH})')
-@click.option('--words', type=click.IntRange(3, 12), default=4, help='Words per passphrase (default: 4, was 3 in v3.1)')
+@click.option('--rsa-bits', type=click.Choice(['2048', '3072', '4096']), default='2048', 
+              help='RSA key size')
+@click.option('--words', type=click.IntRange(3, 12), default=DEFAULT_PASSPHRASE_WORDS, 
+              help=f'Words per passphrase (default: {DEFAULT_PASSPHRASE_WORDS})')
 @click.option('--output', '-o', type=click.Path(), help='Save RSA key to file (requires password)')
 @click.option('--password', '-p', help='Password for RSA key file')
 @click.option('--json', 'as_json', is_flag=True, help='Output as JSON')
@@ -122,8 +158,8 @@ def generate(pin, rsa, pin_length, rsa_bits, words, output, password, as_json):
     Creates a passphrase and optionally a PIN and/or RSA key.
     At least one of --pin or --rsa must be enabled.
     
-    v3.2.0: No more daily passphrases - use one strong passphrase!
+    v3.2.0: Single passphrase (no more daily rotation!)
-    Default increased to 4 words (from 3) for better security.
+    Default increased to 4 words for better security.
     
     \b
     Examples:
@@ -148,7 +184,8 @@ def generate(pin, rsa, pin_length, rsa_bits, words, output, password, as_json):
             use_rsa=rsa,
             pin_length=pin_length,
             rsa_bits=int(rsa_bits),
-            words_per_passphrase=words
+            passphrase_words=words,  # v3.2.0: renamed parameter
+            rsa_password=password if output else None,
         )
         
         if as_json:
@@ -174,21 +211,21 @@ def generate(pin, rsa, pin_length, rsa_bits, words, output, password, as_json):
         click.secho("=" * 60, fg='cyan')
         click.echo()
         
-        click.secho("  MEMORIZE THESE AND CLOSE THIS WINDOW", fg='yellow', bold=True)
+        click.secho("⚠️  MEMORIZE THESE AND CLOSE THIS WINDOW", fg='yellow', bold=True)
         click.secho("    Do not screenshot or save to file!", fg='yellow')
         click.echo()
         
         if creds.pin:
-            click.secho("--- STATIC PIN ---", fg='green')
+            click.secho("─── STATIC PIN ───", fg='green')
             click.secho(f"    {creds.pin}", fg='bright_yellow', bold=True)
             click.echo()
         
-        click.secho("--- PASSPHRASE ---", fg='green')
+        click.secho("─── PASSPHRASE ───", fg='green')
         click.secho(f"    {creds.passphrase}", fg='bright_white', bold=True)
         click.echo()
         
         if creds.rsa_key_pem:
-            click.secho("--- RSA KEY ---", fg='green')
+            click.secho("─── RSA KEY ───", fg='green')
             if output:
                 # Save to file
                 private_key = load_rsa_key(creds.rsa_key_pem.encode())
@@ -200,7 +237,7 @@ def generate(pin, rsa, pin_length, rsa_bits, words, output, password, as_json):
                 click.echo(creds.rsa_key_pem)
             click.echo()
         
-        click.secho("--- SECURITY ---", fg='green')
+        click.secho("─── SECURITY ───", fg='green')
         click.echo(f"    Passphrase entropy: {creds.passphrase_entropy} bits ({words} words)")
         if creds.pin:
             click.echo(f"    PIN entropy:        {creds.pin_entropy} bits")
@@ -210,7 +247,7 @@ def generate(pin, rsa, pin_length, rsa_bits, words, output, password, as_json):
         click.secho(f"    + photo entropy:    80-256 bits", dim=True)
         click.echo()
         
-        click.secho("NOTE: v3.2.0 removed date dependency - use this passphrase anytime!", fg='cyan')
+        click.secho("✓ v3.2.0: Use this passphrase anytime - no date needed!", fg='cyan')
         click.echo()
         
     except Exception as e:
@@ -227,7 +264,7 @@ def generate(pin, rsa, pin_length, rsa_bits, words, output, password, as_json):
 @click.option('--message', '-m', help='Text message to encode')
 @click.option('--message-file', '-f', type=click.Path(exists=True), help='Read text message from file')
 @click.option('--embed-file', '-e', type=click.Path(exists=True), help='Embed a file (binary)')
-@click.option('--passphrase', '-p', required=True, help='Passphrase (v3.2.0: no date needed!)')
+@click.option('--passphrase', '-p', required=True, help='Passphrase')
 @click.option('--pin', help='Static PIN')
 @click.option('--key', '-k', type=click.Path(exists=True), help='RSA key file (.pem)')
 @click.option('--key-qr', type=click.Path(exists=True), help='RSA key from QR code image')
@@ -282,7 +319,7 @@ def encode_cmd(ref, carrier, message, message_file, embed_file, passphrase, pin,
         stegasoo encode -r photo.jpg -c meme.png -p "secure words here now" --pin 123456 -m "secret" --mode dct
         
         # DCT mode - color JPEG
-        stegasoo encode -r photo.jpg -c meme.png -p "my strong passphrase" --pin 123456 -m "secret" \
+        stegasoo encode -r photo.jpg -c meme.png -p "my strong passphrase" --pin 123456 -m "secret" \\
             --mode dct --dct-color color --dct-format jpeg
     """
     # Check DCT mode availability
@@ -378,7 +415,7 @@ def encode_cmd(ref, carrier, message, message_file, embed_file, passphrase, pin,
             message=payload,
             reference_photo=ref_photo,
             carrier_image=carrier_image,
-            passphrase=passphrase,  # Renamed from day_phrase
+            passphrase=passphrase,
             pin=pin or "",
             rsa_key_data=rsa_key_data,
             rsa_password=effective_key_password,
@@ -405,7 +442,6 @@ def encode_cmd(ref, carrier, message, message_file, embed_file, passphrase, pin,
                 color_note = "color preserved" if dct_color_mode == 'color' else "grayscale"
                 format_note = dct_output_format.upper()
                 click.secho(f"  DCT output: {format_note} ({color_note})", dim=True)
-            click.secho("  (v3.2.0: No date needed to decode!)", fg='cyan', dim=True)
         
     except StegasooError as e:
         raise click.ClickException(str(e))
@@ -509,7 +545,7 @@ def decode_cmd(ref, stego, passphrase, pin, key, key_qr, key_password, output, e
         result = decode(
             stego_image=stego_image,
             reference_photo=ref_photo,
-            passphrase=passphrase,  # Renamed from day_phrase
+            passphrase=passphrase,
             pin=pin or "",
             rsa_key_data=rsa_key_data,
             rsa_password=effective_key_password,
@@ -631,7 +667,7 @@ def verify(ref, stego, passphrase, pin, key, key_qr, key_password, embed_mode, a
         result = decode(
             stego_image=stego_image,
             reference_photo=ref_photo,
-            passphrase=passphrase,  # v3.2.0: Renamed from day_phrase
+            passphrase=passphrase,
             pin=pin or "",
             rsa_key_data=rsa_key_data,
             rsa_password=effective_key_password,
@@ -652,16 +688,16 @@ def verify(ref, stego, passphrase, pin, key, key_qr, key_password, embed_mode, a
         
         if as_json:
             import json
-            output = {
+            output_data = {
                 "valid": True,
                 "stego_file": stego,
                 "payload_type": payload_type,
                 "payload_size": payload_size,
             }
             if result.is_file:
-                output["filename"] = result.filename
+                output_data["filename"] = result.filename
-                output["mime_type"] = result.mime_type
+                output_data["mime_type"] = result.mime_type
-            click.echo(json.dumps(output, indent=2))
+            click.echo(json.dumps(output_data, indent=2))
         else:
             click.secho("✓ Valid stego image", fg='green', bold=True)
             click.echo(f"  Payload:  {payload_type} ({payload_desc})")
@@ -670,12 +706,12 @@ def verify(ref, stego, passphrase, pin, key, key_qr, key_password, embed_mode, a
     except (DecryptionError, ExtractionError) as e:
         if as_json:
             import json
-            output = {
+            output_data = {
                 "valid": False,
                 "stego_file": stego,
                 "error": str(e),
             }
-            click.echo(json.dumps(output, indent=2))
+            click.echo(json.dumps(output_data, indent=2))
             sys.exit(1)
         else:
             click.secho("✗ Verification failed", fg='red', bold=True)
@@ -712,7 +748,7 @@ def info(image, as_json):
         
         if as_json:
             import json
-            output = {
+            output_data = {
                 "file": image,
                 "width": result.details['width'],
                 "height": result.details['height'],
@@ -734,12 +770,12 @@ def info(image, as_json):
                     },
                 },
             }
-            click.echo(json.dumps(output, indent=2))
+            click.echo(json.dumps(output_data, indent=2))
             return
         
         click.echo()
         click.secho(f"Image: {image}", bold=True)
-        click.echo(f"  Dimensions:  {result.details['width']} x {result.details['height']}")
+        click.echo(f"  Dimensions:  {result.details['width']} × {result.details['height']}")
         click.echo(f"  Pixels:      {result.details['pixels']:,}")
         click.echo(f"  Mode:        {result.details['mode']}")
         click.echo(f"  Format:      {result.details['format']}")
@@ -789,7 +825,7 @@ def compare(image, payload_size, as_json):
         
         if as_json:
             import json
-            output = {
+            output_data = {
                 "file": image,
                 "width": comparison['width'],
                 "height": comparison['height'],
@@ -812,43 +848,43 @@ def compare(image, payload_size, as_json):
             }
             
             if payload_size:
-                output["payload_check"] = {
+                output_data["payload_check"] = {
                     "size_bytes": payload_size,
                     "fits_lsb": payload_size <= comparison['lsb']['capacity_bytes'],
                     "fits_dct": payload_size <= comparison['dct']['capacity_bytes'],
                 }
             
-            click.echo(json.dumps(output, indent=2))
+            click.echo(json.dumps(output_data, indent=2))
             return
         
         click.echo()
         click.secho(f"=== Mode Comparison: {image} ===", fg='cyan', bold=True)
-        click.echo(f"  Dimensions: {comparison['width']} x {comparison['height']}")
+        click.echo(f"  Dimensions: {comparison['width']} × {comparison['height']}")
         click.echo()
         
         # LSB mode
-        click.secho("  +--- LSB Mode ---", fg='green')
+        click.secho("  ┌─── LSB Mode ───", fg='green')
-        click.echo(f"  | Capacity:  {comparison['lsb']['capacity_bytes']:,} bytes ({comparison['lsb']['capacity_kb']:.1f} KB)")
+        click.echo(f"  │ Capacity:  {comparison['lsb']['capacity_bytes']:,} bytes ({comparison['lsb']['capacity_kb']:.1f} KB)")
-        click.echo(f"  | Output:    {comparison['lsb']['output']}")
+        click.echo(f"  │ Output:    {comparison['lsb']['output']}")
-        click.echo(f"  | Status:    ✓ Available")
+        click.echo(f"  │ Status:    ✓ Available")
-        click.echo("  |")
+        click.echo("  │")
         
         # DCT mode
-        click.secho("  +--- DCT Mode ---", fg='blue')
+        click.secho("  ├─── DCT Mode ───", fg='blue')
-        click.echo(f"  | Capacity:  {comparison['dct']['capacity_bytes']:,} bytes ({comparison['dct']['capacity_kb']:.1f} KB)")
+        click.echo(f"  │ Capacity:  {comparison['dct']['capacity_bytes']:,} bytes ({comparison['dct']['capacity_kb']:.1f} KB)")
-        click.echo(f"  | Ratio:     {comparison['dct']['ratio_vs_lsb']:.1f}% of LSB capacity")
+        click.echo(f"  │ Ratio:     {comparison['dct']['ratio_vs_lsb']:.1f}% of LSB capacity")
         if comparison['dct']['available']:
-            click.echo(f"  | Status:    ✓ Available")
+            click.echo(f"  │ Status:    ✓ Available")
-            click.echo(f"  | Formats:   PNG (lossless), JPEG (smaller)")
+            click.echo(f"  │ Formats:   PNG (lossless), JPEG (smaller)")
-            click.echo(f"  | Colors:    Grayscale (default), Color (v3.0.1)")
+            click.echo(f"  │ Colors:    Grayscale (default), Color")
         else:
-            click.secho(f"  | Status:    ✗ Requires scipy (pip install scipy)", fg='yellow')
+            click.secho(f"  │ Status:    ✗ Requires scipy (pip install scipy)", fg='yellow')
-        click.echo("  |")
+        click.echo("  │")
         
         # Payload check
         if payload_size:
-            click.secho("  +--- Payload Check ---", fg='magenta')
+            click.secho("  ├─── Payload Check ───", fg='magenta')
-            click.echo(f"  | Size:      {payload_size:,} bytes")
+            click.echo(f"  │ Size:      {payload_size:,} bytes")
             
             fits_lsb = payload_size <= comparison['lsb']['capacity_bytes']
             fits_dct = payload_size <= comparison['dct']['capacity_bytes']
@@ -858,27 +894,27 @@ def compare(image, payload_size, as_json):
             lsb_color = 'green' if fits_lsb else 'red'
             dct_color = 'green' if fits_dct else 'red'
             
-            click.echo(f"  | LSB mode:  ", nl=False)
+            click.echo(f"  │ LSB mode:  ", nl=False)
             click.secho(f"{lsb_icon} {'Fits' if fits_lsb else 'Too large'}", fg=lsb_color)
-            click.echo(f"  | DCT mode:  ", nl=False)
+            click.echo(f"  │ DCT mode:  ", nl=False)
             click.secho(f"{dct_icon} {'Fits' if fits_dct else 'Too large'}", fg=dct_color)
-            click.echo("  |")
+            click.echo("  │")
         
         # Recommendation
-        click.secho("  +--- Recommendation ---", fg='yellow')
+        click.secho("  └─── Recommendation ───", fg='yellow')
         if not comparison['dct']['available']:
-            click.echo("  Use LSB mode (DCT unavailable)")
+            click.echo("    Use LSB mode (DCT unavailable)")
         elif payload_size:
             if fits_dct:
-                click.echo("  DCT mode for better stealth (payload fits both modes)")
+                click.echo("    DCT mode for better stealth (payload fits both modes)")
-                click.echo("  Use --dct-color color to preserve original colors")
+                click.echo("    Use --dct-color color to preserve original colors")
             elif fits_lsb:
-                click.echo("  LSB mode (payload too large for DCT)")
+                click.echo("    LSB mode (payload too large for DCT)")
             else:
-                click.secho("  ✗ Payload too large for both modes!", fg='red')
+                click.secho("    ✗ Payload too large for both modes!", fg='red')
         else:
-            click.echo("  LSB for larger payloads, DCT for better stealth")
+            click.echo("    LSB for larger payloads, DCT for better stealth")
-            click.echo("  DCT supports color output with --dct-color color")
+            click.echo("    DCT supports color output with --dct-color color")
         
         click.echo()
         
@@ -893,7 +929,8 @@ def compare(image, payload_size, as_json):
 @cli.command('strip-metadata')
 @click.argument('image', type=click.Path(exists=True))
 @click.option('--output', '-o', type=click.Path(), help='Output file (default: overwrites input)')
-@click.option('--format', '-f', 'output_format', type=click.Choice(['PNG', 'BMP']), default='PNG', help='Output format')
+@click.option('--format', '-f', 'output_format', type=click.Choice(['PNG', 'BMP']), default='PNG', 
+              help='Output format')
 @click.option('--quiet', '-q', is_flag=True, help='Suppress output')
 def strip_metadata_cmd(image, output, output_format, quiet):
     """
@@ -907,6 +944,9 @@ def strip_metadata_cmd(image, output, output_format, quiet):
         stegasoo strip-metadata photo.jpg -o clean.png
         stegasoo strip-metadata photo.jpg  # Overwrites as PNG
     """
+    if not HAS_STRIP_METADATA:
+        raise click.ClickException("strip_image_metadata not available")
+    
     try:
         image_data = Path(image).read_bytes()
         original_size = len(image_data)
@@ -967,7 +1007,7 @@ def modes():
     click.echo()
     
     # DCT Options
-    click.secho("  DCT Options (v3.0.1)", fg='magenta', bold=True)
+    click.secho("  DCT Options", fg='magenta', bold=True)
     click.echo("    Output format:")
     click.echo("      --dct-format png     Lossless, larger file (default)")
     click.echo("      --dct-format jpeg    Lossy, smaller, more natural")
@@ -981,6 +1021,7 @@ def modes():
     click.secho("  v3.2.0 Changes:", fg='cyan', bold=True)
     click.echo("    ✓ No date parameters needed")
     click.echo("    ✓ Single passphrase (no daily rotation)")
+    click.echo("    ✓ Default passphrase increased to 4 words")
     click.echo("    ✓ True asynchronous communications")
     click.echo()
     

src/main.py

@@ -1,10 +1,51 @@
 #!/usr/bin/env python3
-"""Main entry point."""
+"""
+Stegasoo - Main Entry Point
+
+This module provides the main entry point for the stegasoo package.
+It can be run directly or via the installed console script.
+
+Usage:
+    python -m stegasoo --help
+    python src/main.py --help
+    stegasoo --help  (if installed via pip)
+"""
+
+import sys
 
 
 def main():
-    """Main function."""
+    """
-    print("Hello, World!")
+    Main entry point for Stegasoo CLI.
+    
+    Delegates to the CLI module for command parsing and execution.
+    """
+    try:
+        from stegasoo.cli import main as cli_main
+        cli_main()
+    except ImportError as e:
+        # Provide helpful error if dependencies are missing
+        print(f"Error: Could not import stegasoo package: {e}", file=sys.stderr)
+        print("\nMake sure stegasoo is installed:", file=sys.stderr)
+        print("  pip install -e .", file=sys.stderr)
+        print("\nOr run from the src directory:", file=sys.stderr)
+        print("  PYTHONPATH=src python -m stegasoo", file=sys.stderr)
+        sys.exit(1)
+    except KeyboardInterrupt:
+        print("\nInterrupted.", file=sys.stderr)
+        sys.exit(130)
+    except Exception as e:
+        print(f"Error: {e}", file=sys.stderr)
+        sys.exit(1)
+
+
+def version():
+    """Print version and exit."""
+    try:
+        from stegasoo import __version__
+        print(f"stegasoo {__version__}")
+    except ImportError:
+        print("stegasoo (version unknown)")
 
 
 if __name__ == "__main__":

src/stegasoo/batch.py

@@ -1,8 +1,12 @@
 """
-Stegasoo Batch Processing Module
+Stegasoo Batch Processing Module (v3.2.0)
 
 Enables encoding/decoding multiple files in a single operation.
 Supports parallel processing, progress tracking, and detailed reporting.
+
+Changes in v3.2.0:
+- BatchCredentials: renamed day_phrase → passphrase, removed date_str
+- Updated all credential handling to use v3.2.0 API
 """
 
 import os
@@ -64,37 +68,57 @@ class BatchItem:
 @dataclass
 class BatchCredentials:
     """
-    Credentials for batch encode/decode operations.
+    Credentials for batch encode/decode operations (v3.2.0).
     
     Provides a structured way to pass authentication factors
     for batch processing instead of using plain dicts.
     
+    Changes in v3.2.0:
+    - Renamed day_phrase → passphrase
+    - Removed date_str (no longer used in cryptographic operations)
+    
     Example:
         creds = BatchCredentials(
             reference_photo=ref_bytes,
-            day_phrase="apple forest thunder",
+            passphrase="apple forest thunder mountain",
             pin="123456"
         )
         result = processor.batch_encode(images, creds, message="secret")
     """
     reference_photo: bytes
-    day_phrase: str
+    passphrase: str  # v3.2.0: renamed from day_phrase
     pin: str = ""
     rsa_key_data: Optional[bytes] = None
     rsa_password: Optional[str] = None
-    date_str: Optional[str] = None  # YYYY-MM-DD, defaults to today
     
     def to_dict(self) -> dict:
-        """Convert to dictionary for legacy API compatibility."""
+        """Convert to dictionary for API compatibility."""
         return {
             "reference_photo": self.reference_photo,
-            "day_phrase": self.day_phrase,
+            "passphrase": self.passphrase,
             "pin": self.pin,
             "rsa_key_data": self.rsa_key_data,
             "rsa_password": self.rsa_password,
-            "date_str": self.date_str,
         }
     
+    @classmethod
+    def from_dict(cls, data: dict) -> 'BatchCredentials':
+        """
+        Create BatchCredentials from a dictionary.
+        
+        Handles both v3.2.0 format (passphrase) and legacy format (day_phrase).
+        """
+        # Handle legacy 'day_phrase' key
+        passphrase = data.get('passphrase') or data.get('day_phrase', '')
+        
+        return cls(
+            reference_photo=data['reference_photo'],
+            passphrase=passphrase,
+            pin=data.get('pin', ''),
+            rsa_key_data=data.get('rsa_key_data'),
+            rsa_password=data.get('rsa_password'),
+        )
+
 
 @dataclass
 class BatchResult:
@@ -140,23 +164,39 @@ ProgressCallback = Callable[[int, int, BatchItem], None]
 
 class BatchProcessor:
     """
-    Handles batch encoding/decoding operations.
+    Handles batch encoding/decoding operations (v3.2.0).
     
     Usage:
         processor = BatchProcessor(max_workers=4)
         
-        # Batch encode
+        # Batch encode with BatchCredentials
+        creds = BatchCredentials(
+            reference_photo=ref_bytes,
+            passphrase="apple forest thunder mountain",
+            pin="123456"
+        )
         result = processor.batch_encode(
             images=['img1.png', 'img2.png'],
             message="Secret message",
             output_dir="./encoded/",
-            credentials={"phrase": "...", "pin": "..."},
+            credentials=creds,
+        )
+        
+        # Batch encode with dict credentials
+        result = processor.batch_encode(
+            images=['img1.png', 'img2.png'],
+            message="Secret message",
+            credentials={
+                "reference_photo": ref_bytes,
+                "passphrase": "apple forest thunder mountain",
+                "pin": "123456"
+            },
         )
         
         # Batch decode
         result = processor.batch_decode(
             images=['encoded1.png', 'encoded2.png'],
-            credentials={"phrase": "...", "pin": "..."},
+            credentials=creds,
         )
     """
     
@@ -202,6 +242,26 @@ class BatchProcessor:
         """Check if path is a valid image file."""
         return path.suffix.lower().lstrip('.') in ALLOWED_IMAGE_EXTENSIONS
     
+    def _normalize_credentials(
+        self, 
+        credentials: dict | BatchCredentials | None
+    ) -> BatchCredentials:
+        """
+        Normalize credentials to BatchCredentials object.
+        
+        Handles both dict and BatchCredentials input, and legacy 'day_phrase' key.
+        """
+        if credentials is None:
+            raise ValueError("Credentials are required")
+        
+        if isinstance(credentials, BatchCredentials):
+            return credentials
+        
+        if isinstance(credentials, dict):
+            return BatchCredentials.from_dict(credentials)
+        
+        raise ValueError(f"Invalid credentials type: {type(credentials)}")
+    
     def batch_encode(
         self,
         images: list[str | Path],
@@ -209,7 +269,7 @@ class BatchProcessor:
         file_payload: Optional[Path] = None,
         output_dir: Optional[Path] = None,
         output_suffix: str = "_encoded",
-        credentials: dict = None,
+        credentials: dict | BatchCredentials | None = None,
         compress: bool = True,
         recursive: bool = False,
         progress_callback: Optional[ProgressCallback] = None,
@@ -224,7 +284,7 @@ class BatchProcessor:
             file_payload: File to embed (mutually exclusive with message)
             output_dir: Output directory (default: same as input)
             output_suffix: Suffix for output files
-            credentials: Dict with 'phrase', 'pin', and optionally 'private_key'
+            credentials: BatchCredentials or dict with 'passphrase', 'pin', etc.
             compress: Enable compression
             recursive: Search directories recursively
             progress_callback: Called for each item: callback(current, total, item)
@@ -236,8 +296,8 @@ class BatchProcessor:
         if message is None and file_payload is None:
             raise ValueError("Either message or file_payload must be provided")
         
-        if credentials is None:
+        # Normalize credentials to BatchCredentials
-            raise ValueError("Credentials are required")
+        creds = self._normalize_credentials(credentials)
         
         result = BatchResult(operation="encode")
         image_paths = list(self.find_images(images, recursive))
@@ -274,15 +334,15 @@ class BatchProcessor:
                         output_path=item.output_path,
                         message=message,
                         file_payload=file_payload,
-                        credentials=credentials,
+                        credentials=creds.to_dict(),
                         compress=compress,
                     )
                 else:
-                    # Placeholder - actual implementation would call stego.encode()
+                    # Use stegasoo encode
-                    self._mock_encode(item, message, credentials, compress)
+                    self._do_encode(item, message, file_payload, creds, compress)
                 
                 item.status = BatchStatus.SUCCESS
-                item.output_size = item.output_path.stat().st_size if item.output_path.exists() else 0
+                item.output_size = item.output_path.stat().st_size if item.output_path and item.output_path.exists() else 0
                 item.message = f"Encoded to {item.output_path.name}"
                 
             except Exception as e:
@@ -301,7 +361,7 @@ class BatchProcessor:
         self,
         images: list[str | Path],
         output_dir: Optional[Path] = None,
-        credentials: dict = None,
+        credentials: dict | BatchCredentials | None = None,
         recursive: bool = False,
         progress_callback: Optional[ProgressCallback] = None,
         decode_func: Callable = None,
@@ -312,7 +372,7 @@ class BatchProcessor:
         Args:
             images: List of image paths or directories
             output_dir: Output directory for file payloads (default: same as input)
-            credentials: Dict with 'phrase', 'pin', and optionally 'private_key'
+            credentials: BatchCredentials or dict with 'passphrase', 'pin', etc.
             recursive: Search directories recursively
             progress_callback: Called for each item: callback(current, total, item)
             decode_func: Custom decode function (for integration)
@@ -320,8 +380,8 @@ class BatchProcessor:
         Returns:
             BatchResult with decoded messages in item.message fields
         """
-        if credentials is None:
+        # Normalize credentials to BatchCredentials
-            raise ValueError("Credentials are required")
+        creds = self._normalize_credentials(credentials)
         
         result = BatchResult(operation="decode")
         image_paths = list(self.find_images(images, recursive))
@@ -351,12 +411,12 @@ class BatchProcessor:
                     decoded = decode_func(
                         image_path=item.input_path,
                         output_dir=item.output_path,
-                        credentials=credentials,
+                        credentials=creds.to_dict(),
                     )
                     item.message = decoded.get('message', '') if isinstance(decoded, dict) else str(decoded)
                 else:
-                    # Placeholder - actual implementation would call stego.decode()
+                    # Use stegasoo decode
-                    item.message = self._mock_decode(item, credentials)
+                    item.message = self._do_decode(item, creds)
                 
                 item.status = BatchStatus.SUCCESS
                 
@@ -404,14 +464,112 @@ class BatchProcessor:
         
         result.end_time = time.time()
     
-    def _mock_encode(self, item: BatchItem, message: str, credentials: dict, compress: bool) -> None:
+    def _do_encode(
+        self,
+        item: BatchItem,
+        message: Optional[str],
+        file_payload: Optional[Path],
+        creds: BatchCredentials,
+        compress: bool
+    ) -> None:
+        """
+        Perform actual encoding using stegasoo.encode.
+        
+        Override this method to customize encoding behavior.
+        """
+        try:
+            from .encode import encode, encode_file
+            from .models import FilePayload
+            
+            # Read carrier image
+            carrier_image = item.input_path.read_bytes()
+            
+            if file_payload:
+                # Encode file
+                payload = FilePayload.from_file(str(file_payload))
+                result = encode(
+                    message=payload,
+                    reference_photo=creds.reference_photo,
+                    carrier_image=carrier_image,
+                    passphrase=creds.passphrase,
+                    pin=creds.pin,
+                    rsa_key_data=creds.rsa_key_data,
+                    rsa_password=creds.rsa_password,
+                )
+            else:
+                # Encode text message
+                result = encode(
+                    message=message,
+                    reference_photo=creds.reference_photo,
+                    carrier_image=carrier_image,
+                    passphrase=creds.passphrase,
+                    pin=creds.pin,
+                    rsa_key_data=creds.rsa_key_data,
+                    rsa_password=creds.rsa_password,
+                )
+            
+            # Write output
+            if item.output_path:
+                item.output_path.write_bytes(result.stego_image)
+                
+        except ImportError:
+            # Fallback to mock if stegasoo.encode not available
+            self._mock_encode(item, message, creds, compress)
+    
+    def _do_decode(
+        self,
+        item: BatchItem,
+        creds: BatchCredentials,
+    ) -> str:
+        """
+        Perform actual decoding using stegasoo.decode.
+        
+        Override this method to customize decoding behavior.
+        """
+        try:
+            from .decode import decode
+            
+            # Read stego image
+            stego_image = item.input_path.read_bytes()
+            
+            result = decode(
+                stego_image=stego_image,
+                reference_photo=creds.reference_photo,
+                passphrase=creds.passphrase,
+                pin=creds.pin,
+                rsa_key_data=creds.rsa_key_data,
+                rsa_password=creds.rsa_password,
+            )
+            
+            if result.is_text:
+                return result.message or ""
+            else:
+                # File payload - save it
+                if item.output_path and result.file_data:
+                    output_file = item.output_path / (result.filename or "extracted_file")
+                    output_file.write_bytes(result.file_data)
+                    return f"File extracted: {result.filename or 'extracted_file'}"
+                return f"[File: {result.filename or 'binary data'}]"
+                
+        except ImportError:
+            # Fallback to mock if stegasoo.decode not available
+            return self._mock_decode(item, creds)
+    
+    def _mock_encode(
+        self,
+        item: BatchItem,
+        message: str,
+        creds: BatchCredentials,
+        compress: bool
+    ) -> None:
         """Mock encode for testing - replace with actual stego.encode()"""
         # This is a placeholder - in real usage, you'd call your actual encode function
         # For now, just copy the file to simulate encoding
         import shutil
-        shutil.copy(item.input_path, item.output_path)
+        if item.output_path:
+            shutil.copy(item.input_path, item.output_path)
     
-    def _mock_decode(self, item: BatchItem, credentials: dict) -> str:
+    def _mock_decode(self, item: BatchItem, creds: BatchCredentials) -> str:
         """Mock decode for testing - replace with actual stego.decode()"""
         # This is a placeholder - in real usage, you'd call your actual decode function
         return "[Decoded message would appear here]"

src/stegasoo/channel.py

@@ -1,5 +1,5 @@
 """
-Channel Key Management for Stegasoo
+Channel Key Management for Stegasoo (v3.2.0)
 
 A channel key ties encode/decode operations to a specific deployment or group.
 Messages encoded with one channel key can only be decoded by systems with the
@@ -15,6 +15,16 @@ Storage priority:
 1. Environment variable: STEGASOO_CHANNEL_KEY
 2. Config file: ~/.stegasoo/channel.key or ./config/channel.key
 3. None (public mode - compatible with any instance without a channel key)
+
+STATUS: This module is IMPLEMENTED but NOT YET INTEGRATED into crypto.py.
+        The get_channel_key_hash() function should be mixed into key derivation
+        in a future release.
+
+TODO (v3.3.0):
+- Integrate get_channel_key_hash() into derive_hybrid_key() in crypto.py
+- Add --channel-key option to CLI
+- Add channel key display to web UI
+- Document channel key feature in README
 """
 
 import os
@@ -247,9 +257,12 @@ def get_channel_key_hash(key: Optional[str] = None) -> Optional[bytes]:
     """
     Get the channel key as a 32-byte hash suitable for key derivation.
     
-    This hash is mixed into the Argon2 key derivation to bind
+    This hash is designed to be mixed into the Argon2 key derivation to bind
     encryption to a specific channel.
     
+    NOTE: This function is implemented but not yet integrated into crypto.py.
+          See TODO at top of file for integration plan.
+    
     Args:
         key: Channel key (if None, reads from config)
         

src/stegasoo/cli.py

@@ -1,7 +1,11 @@
 """
-Stegasoo CLI Module
+Stegasoo CLI Module (v3.2.0)
 
 Command-line interface with batch processing and compression support.
+
+Changes in v3.2.0:
+- Updated to use DEFAULT_PASSPHRASE_WORDS (consistency with v3.2.0 naming)
+- Updated help text to use 'passphrase' terminology
 """
 
 import sys
@@ -16,7 +20,7 @@ from .constants import (
     MAX_MESSAGE_SIZE,
     MAX_FILE_PAYLOAD_SIZE,
     DEFAULT_PIN_LENGTH,
-    DEFAULT_PHRASE_WORDS,
+    DEFAULT_PASSPHRASE_WORDS,  # v3.2.0: renamed from DEFAULT_PHRASE_WORDS
 )
 from .compression import (
     CompressionAlgorithm,
@@ -60,8 +64,8 @@ def cli(ctx, json_output):
 @click.option('-f', '--file', 'file_payload', type=click.Path(exists=True), 
               help='File to embed instead of message')
 @click.option('-o', '--output', type=click.Path(), help='Output image path')
-@click.option('--phrase', prompt=True, hide_input=True, 
+@click.option('--passphrase', prompt=True, hide_input=True, 
-              confirmation_prompt=True, help='Passphrase')
+              confirmation_prompt=True, help='Passphrase (recommend 4+ words)')
 @click.option('--pin', prompt=True, hide_input=True,
               confirmation_prompt=True, help='PIN code')
 @click.option('--compress/--no-compress', default=True, 
@@ -70,14 +74,14 @@ def cli(ctx, json_output):
               default='zlib', help='Compression algorithm')
 @click.option('--dry-run', is_flag=True, help='Show capacity usage without encoding')
 @click.pass_context
-def encode(ctx, image, message, file_payload, output, phrase, pin, 
+def encode(ctx, image, message, file_payload, output, passphrase, pin, 
            compress, algorithm, dry_run):
     """
     Encode a message or file into an image.
     
     Examples:
     
-        stegasoo encode photo.png -m "Secret message" --phrase --pin
+        stegasoo encode photo.png -m "Secret message" --passphrase --pin
         
         stegasoo encode photo.png -f secret.pdf -o encoded.png
     """
@@ -109,7 +113,7 @@ def encode(ctx, image, message, file_payload, output, phrase, pin,
     # Get image capacity
     with Image.open(image) as img:
         width, height = img.size
-        capacity_bytes = (width * height * 3 // 8) - 100
+        capacity_bytes = (width * height * 3 // 8) - 69  # v3.2.0: corrected overhead
     
     if dry_run:
         result = {
@@ -153,18 +157,18 @@ def encode(ctx, image, message, file_payload, output, phrase, pin,
 
 @cli.command()
 @click.argument('image', type=click.Path(exists=True))
-@click.option('--phrase', prompt=True, hide_input=True, help='Passphrase')
+@click.option('--passphrase', prompt=True, hide_input=True, help='Passphrase')
 @click.option('--pin', prompt=True, hide_input=True, help='PIN code')
 @click.option('-o', '--output', type=click.Path(), 
               help='Output path for file payloads')
 @click.pass_context
-def decode(ctx, image, phrase, pin, output):
+def decode(ctx, image, passphrase, pin, output):
     """
     Decode a message or file from an image.
     
     Examples:
     
-        stegasoo decode encoded.png --phrase --pin
+        stegasoo decode encoded.png --passphrase --pin
         
         stegasoo decode encoded.png -o ./extracted/
     """
@@ -201,8 +205,8 @@ def batch():
 @click.option('-o', '--output-dir', type=click.Path(),
               help='Output directory (default: same as input)')
 @click.option('--suffix', default='_encoded', help='Output filename suffix')
-@click.option('--phrase', prompt=True, hide_input=True,
+@click.option('--passphrase', prompt=True, hide_input=True,
-              confirmation_prompt=True, help='Passphrase')
+              confirmation_prompt=True, help='Passphrase (recommend 4+ words)')
 @click.option('--pin', prompt=True, hide_input=True,
               confirmation_prompt=True, help='PIN code')
 @click.option('--compress/--no-compress', default=True,
@@ -215,13 +219,13 @@ def batch():
 @click.option('-v', '--verbose', is_flag=True, help='Show detailed output')
 @click.pass_context
 def batch_encode(ctx, images, message, file_payload, output_dir, suffix,
-                 phrase, pin, compress, algorithm, recursive, jobs, verbose):
+                 passphrase, pin, compress, algorithm, recursive, jobs, verbose):
     """
     Encode message into multiple images.
     
     Examples:
     
-        stegasoo batch encode *.png -m "Secret" --phrase --pin
+        stegasoo batch encode *.png -m "Secret" --passphrase --pin
         
         stegasoo batch encode ./photos/ -r -o ./encoded/
     """
@@ -236,7 +240,8 @@ def batch_encode(ctx, images, message, file_payload, output_dir, suffix,
             status = "✓" if item.status.value == "success" else "✗"
             click.echo(f"[{current}/{total}] {status} {item.input_path.name}")
     
-    credentials = {"phrase": phrase, "pin": pin}
+    # v3.2.0: Use 'passphrase' key instead of 'phrase'
+    credentials = {"passphrase": passphrase, "pin": pin}
     
     result = processor.batch_encode(
         images=list(images),
@@ -260,20 +265,20 @@ def batch_encode(ctx, images, message, file_payload, output_dir, suffix,
 @click.argument('images', nargs=-1, required=True, type=click.Path(exists=True))
 @click.option('-o', '--output-dir', type=click.Path(),
               help='Output directory for file payloads')
-@click.option('--phrase', prompt=True, hide_input=True, help='Passphrase')
+@click.option('--passphrase', prompt=True, hide_input=True, help='Passphrase')
 @click.option('--pin', prompt=True, hide_input=True, help='PIN code')
 @click.option('-r', '--recursive', is_flag=True,
               help='Search directories recursively')
 @click.option('-j', '--jobs', default=4, help='Parallel workers (default: 4)')
 @click.option('-v', '--verbose', is_flag=True, help='Show detailed output')
 @click.pass_context
-def batch_decode(ctx, images, output_dir, phrase, pin, recursive, jobs, verbose):
+def batch_decode(ctx, images, output_dir, passphrase, pin, recursive, jobs, verbose):
     """
     Decode messages from multiple images.
     
     Examples:
     
-        stegasoo batch decode encoded*.png --phrase --pin
+        stegasoo batch decode encoded*.png --passphrase --pin
         
         stegasoo batch decode ./encoded/ -r -o ./extracted/
     """
@@ -285,7 +290,8 @@ def batch_decode(ctx, images, output_dir, phrase, pin, recursive, jobs, verbose)
             status = "✓" if item.status.value == "success" else "✗"
             click.echo(f"[{current}/{total}] {status} {item.input_path.name}")
     
-    credentials = {"phrase": phrase, "pin": pin}
+    # v3.2.0: Use 'passphrase' key instead of 'phrase'
+    credentials = {"passphrase": passphrase, "pin": pin}
     
     result = processor.batch_decode(
         images=list(images),
@@ -348,14 +354,14 @@ def batch_check(ctx, images, recursive):
 # =============================================================================
 
 @cli.command()
-@click.option('--words', default=DEFAULT_PHRASE_WORDS, 
+@click.option('--words', default=DEFAULT_PASSPHRASE_WORDS, 
-              help=f'Number of words (default: {DEFAULT_PHRASE_WORDS})')
+              help=f'Number of words in passphrase (default: {DEFAULT_PASSPHRASE_WORDS})')
 @click.option('--pin-length', default=DEFAULT_PIN_LENGTH,
               help=f'PIN length (default: {DEFAULT_PIN_LENGTH})')
 @click.pass_context
 def generate(ctx, words, pin_length):
     """
-    Generate random credentials (phrase + PIN).
+    Generate random credentials (passphrase + PIN).
     
     Examples:
     
@@ -367,26 +373,36 @@ def generate(ctx, words, pin_length):
     
     # Generate PIN
     pin = ''.join(str(secrets.randbelow(10)) for _ in range(pin_length))
+    # Ensure PIN doesn't start with 0
+    if pin[0] == '0':
+        pin = str(secrets.randbelow(9) + 1) + pin[1:]
     
-    # Generate phrase (would use BIP-39 wordlist)
+    # Generate passphrase (would use BIP-39 wordlist)
     # Placeholder - actual implementation uses constants.get_wordlist()
-    sample_words = ['alpha', 'bravo', 'charlie', 'delta', 'echo', 'foxtrot',
+    try:
-                    'golf', 'hotel', 'india', 'juliet', 'kilo', 'lima']
+        from .constants import get_wordlist
-    phrase_words = [secrets.choice(sample_words) for _ in range(words)]
+        wordlist = get_wordlist()
-    phrase = ' '.join(phrase_words)
+        phrase_words = [secrets.choice(wordlist) for _ in range(words)]
+    except (ImportError, FileNotFoundError):
+        # Fallback for testing
+        sample_words = ['alpha', 'bravo', 'charlie', 'delta', 'echo', 'foxtrot',
+                        'golf', 'hotel', 'india', 'juliet', 'kilo', 'lima']
+        phrase_words = [secrets.choice(sample_words) for _ in range(words)]
+    
+    passphrase = ' '.join(phrase_words)
     
     result = {
-        "phrase": phrase,
+        "passphrase": passphrase,
         "pin": pin,
-        "phrase_words": words,
+        "passphrase_words": words,
         "pin_length": pin_length,
     }
     
     if ctx.obj.get('json'):
         click.echo(json.dumps(result, indent=2))
     else:
-        click.echo(f"Phrase: {phrase}")
+        click.echo(f"Passphrase: {passphrase}")
-        click.echo(f"PIN:    {pin}")
+        click.echo(f"PIN:        {pin}")
         click.echo("\n⚠️  Save these credentials securely - they cannot be recovered!")
 
 

src/stegasoo/dct_steganography.py

@@ -1,5 +1,5 @@
 """
-DCT Domain Steganography Module (v3.0.2)
+DCT Domain Steganography Module (v3.2.0)
 
 Embeds data in DCT coefficients with two approaches:
 1. PNG output: Scipy-based DCT transform (grayscale or color)
@@ -8,11 +8,16 @@ Embeds data in DCT coefficients with two approaches:
 The JPEG approach is the "correct" way to do JPEG steganography because
 it directly modifies the already-quantized coefficients without re-encoding.
 
-New in v3.0.2:
+Changes in v3.0.2:
 - jpegio integration for proper JPEG coefficient embedding
 - Falls back to warning if jpegio not available for JPEG output
 - Maintains backward compatibility with v3.0.1
 
+Changes in v3.2.0:
+- Fixed color-mode extraction to properly extract from Y channel
+- Added _extract_from_y_channel() for accurate color-mode extraction
+- Improved extraction robustness for both grayscale and color modes
+
 Requires: scipy (for PNG mode), optionally jpegio (for JPEG mode)
 """
 
@@ -83,6 +88,9 @@ JPEGIO_MAGIC = b'JPGS'
 JPEGIO_MIN_COEF_MAGNITUDE = 2
 JPEGIO_EMBED_CHANNEL = 0  # Y channel
 
+# Flag bits for header
+FLAG_COLOR_MODE = 0x01  # Set if embedded in color mode (Y channel of YCbCr)
+
 
 # ============================================================================
 # DATA CLASSES
@@ -167,6 +175,37 @@ def _to_grayscale(image_data: bytes) -> np.ndarray:
     return np.array(gray, dtype=np.float64)
 
 
+def _extract_y_channel(image_data: bytes) -> np.ndarray:
+    """
+    Extract Y (luminance) channel from image for color-mode extraction.
+    
+    This uses the same YCbCr conversion as embedding to ensure
+    accurate extraction from color-mode stego images.
+    
+    Args:
+        image_data: Image file bytes
+        
+    Returns:
+        Y channel as float64 numpy array
+    """
+    img = Image.open(io.BytesIO(image_data))
+    
+    # Convert to RGB if needed
+    if img.mode != 'RGB':
+        img = img.convert('RGB')
+    
+    rgb_array = np.array(img, dtype=np.float64)
+    
+    # Extract Y channel using ITU-R BT.601 (same as embedding)
+    R = rgb_array[:, :, 0]
+    G = rgb_array[:, :, 1]
+    B = rgb_array[:, :, 2]
+    
+    Y = 0.299 * R + 0.587 * G + 0.114 * B
+    
+    return Y
+
+
 def _pad_to_blocks(image: np.ndarray) -> Tuple[np.ndarray, Tuple[int, int]]:
     """Pad image dimensions to be divisible by block size."""
     h, w = image.shape
@@ -376,9 +415,9 @@ def _jpegio_generate_order(num_positions: int, seed: bytes) -> list:
     return order
 
 
-def _jpegio_create_header(data_length: int) -> bytes:
+def _jpegio_create_header(data_length: int, flags: int = 0) -> bytes:
     """Create header for jpegio embedding."""
-    return struct.pack('>4sBBI', JPEGIO_MAGIC, 1, 0, data_length)
+    return struct.pack('>4sBBI', JPEGIO_MAGIC, 1, flags, data_length)
 
 
 def _jpegio_parse_header(header_bytes: bytes) -> Tuple[int, int, int]:
@@ -549,6 +588,9 @@ def _embed_scipy_dct(
     img = Image.open(io.BytesIO(carrier_image))
     width, height = img.size
     
+    # Set flags for header
+    flags = FLAG_COLOR_MODE if color_mode == 'color' else 0
+    
     if color_mode == 'color' and img.mode in ('RGB', 'RGBA'):
         # Color mode: convert to YCbCr, embed in Y only, preserve Cb/Cr
         if img.mode == 'RGBA':
@@ -560,8 +602,8 @@ def _embed_scipy_dct(
         # Pad Y channel
         Y_padded, original_size = _pad_to_blocks(Y)
         
-        # Embed in Y channel
+        # Embed in Y channel (with color flag)
-        Y_embedded = _embed_in_channel(Y_padded, data, seed, capacity_info)
+        Y_embedded = _embed_in_channel(Y_padded, data, seed, capacity_info, flags)
         
         # Unpad
         Y_result = _unpad_image(Y_embedded, original_size)
@@ -576,13 +618,13 @@ def _embed_scipy_dct(
         image = _to_grayscale(carrier_image)
         padded, original_size = _pad_to_blocks(image)
         
-        embedded = _embed_in_channel(padded, data, seed, capacity_info)
+        embedded = _embed_in_channel(padded, data, seed, capacity_info, flags)
         
         result = _unpad_image(embedded, original_size)
         stego_bytes = _save_stego_image(result, output_format)
     
     # Calculate stats
-    header = _create_header(len(data))
+    header = _create_header(len(data), flags)
     payload = header + data
     bits = len(payload) * 8
     
@@ -607,9 +649,10 @@ def _embed_in_channel(
     data: bytes,
     seed: bytes,
     capacity_info: DCTCapacityInfo,
+    flags: int = 0,
 ) -> np.ndarray:
     """Embed data in a single channel using DCT."""
-    header = _create_header(len(data))
+    header = _create_header(len(data), flags)
     payload = header + data
     
     bits = []
@@ -677,14 +720,14 @@ def _embed_jpegio(
     input_path = _jpegio_bytes_to_file(carrier_image, suffix='.jpg')
     output_path = tempfile.mktemp(suffix='.jpg')
     
+    # Set flags
+    flags = FLAG_COLOR_MODE if color_mode == 'color' else 0
+    
     try:
         # Read JPEG with jpegio
         jpeg = jio.read(input_path)
         
         # Get Y channel coefficients (channel 0)
-        # For grayscale mode, we could convert to grayscale, but jpegio
-        # works with the original JPEG which already has color info.
-        # The color_mode primarily affects the output interpretation.
         coef_array = jpeg.coef_arrays[JPEGIO_EMBED_CHANNEL]
         
         # Find usable positions
@@ -693,8 +736,8 @@ def _embed_jpegio(
         # Generate pseudo-random order
         order = _jpegio_generate_order(len(all_positions), seed)
         
-        # Create payload
+        # Create payload with flags
-        header = _jpegio_create_header(len(data))
+        header = _jpegio_create_header(len(data), flags)
         payload = header + data
         
         # Convert to bits
@@ -764,7 +807,8 @@ def extract_from_dct(
     """
     Extract data from DCT stego image.
     
-    Automatically detects whether image uses scipy DCT or jpegio embedding.
+    Automatically detects whether image uses scipy DCT or jpegio embedding,
+    and handles both grayscale and color modes.
     
     Args:
         stego_image: Stego image bytes
@@ -790,9 +834,28 @@ def extract_from_dct(
 
 
 def _extract_scipy_dct(stego_image: bytes, seed: bytes) -> bytes:
-    """Extract using scipy DCT (for PNG images)."""
+    """
-    image = _to_grayscale(stego_image)
+    Extract using scipy DCT (for PNG images).
-    padded, original_size = _pad_to_blocks(image)
+    
+    v3.2.0: Now properly handles both grayscale and color modes by
+    first trying to detect the mode from header flags, then extracting
+    from the appropriate channel.
+    """
+    # First, try extracting from grayscale to get header and detect mode
+    # This works because even color-mode images can be converted to grayscale
+    # and the Y channel ≈ grayscale for extraction purposes
+    
+    # Try Y channel extraction first (works for both color and grayscale)
+    img = Image.open(io.BytesIO(stego_image))
+    
+    if img.mode in ('RGB', 'RGBA'):
+        # Extract from Y channel (more accurate for color-mode images)
+        channel = _extract_y_channel(stego_image)
+    else:
+        # Grayscale image
+        channel = _to_grayscale(stego_image)
+    
+    padded, original_size = _pad_to_blocks(channel)
     
     h, w = padded.shape
     blocks_x = w // BLOCK_SIZE
@@ -816,7 +879,7 @@ def _extract_scipy_dct(stego_image: bytes, seed: bytes) -> bytes:
         
         if len(all_bits) >= HEADER_SIZE * 8:
             try:
-                _, _, data_length = _parse_header(all_bits[:HEADER_SIZE * 8])
+                _, flags, data_length = _parse_header(all_bits[:HEADER_SIZE * 8])
                 total_needed = (HEADER_SIZE + data_length) * 8
                 if len(all_bits) >= total_needed:
                     break
@@ -825,6 +888,9 @@ def _extract_scipy_dct(stego_image: bytes, seed: bytes) -> bytes:
     
     version, flags, data_length = _parse_header(all_bits)
     
+    # Check if color mode flag is set (for informational purposes)
+    is_color_mode = bool(flags & FLAG_COLOR_MODE)
+    
     data_bits = all_bits[HEADER_SIZE * 8:(HEADER_SIZE + data_length) * 8]
     
     data = bytes([

src/stegasoo/keygen.py

@@ -1,7 +1,12 @@
 """
-Stegasoo Key Generation
+Stegasoo Key Generation (v3.2.0)
 
 Generate PINs, passphrases, and RSA keys.
+
+Changes in v3.2.0:
+- generate_credentials() now returns Credentials with single passphrase
+- Removed generate_day_phrases() from main API (kept for legacy compatibility)
+- Updated to use PASSPHRASE constants
 """
 
 import secrets
@@ -16,7 +21,7 @@ from cryptography.hazmat.backends import default_backend
 from .constants import (
     DAY_NAMES,
     MIN_PIN_LENGTH, MAX_PIN_LENGTH, DEFAULT_PIN_LENGTH,
-    MIN_PHRASE_WORDS, MAX_PHRASE_WORDS, DEFAULT_PHRASE_WORDS,
+    MIN_PASSPHRASE_WORDS, MAX_PASSPHRASE_WORDS, DEFAULT_PASSPHRASE_WORDS,
     MIN_RSA_BITS, VALID_RSA_SIZES, DEFAULT_RSA_BITS,
     get_wordlist,
 )
@@ -57,7 +62,7 @@ def generate_pin(length: int = DEFAULT_PIN_LENGTH) -> str:
     return pin
 
 
-def generate_phrase(words_per_phrase: int = DEFAULT_PHRASE_WORDS) -> str:
+def generate_phrase(words_per_phrase: int = DEFAULT_PASSPHRASE_WORDS) -> str:
     """
     Generate a random passphrase from BIP-39 wordlist.
     
@@ -68,13 +73,13 @@ def generate_phrase(words_per_phrase: int = DEFAULT_PHRASE_WORDS) -> str:
         Space-separated phrase
         
     Example:
-        >>> generate_phrase(3)
+        >>> generate_phrase(4)
-        "apple forest thunder"
+        "apple forest thunder mountain"
     """
-    debug.validate(MIN_PHRASE_WORDS <= words_per_phrase <= MAX_PHRASE_WORDS,
+    debug.validate(MIN_PASSPHRASE_WORDS <= words_per_phrase <= MAX_PASSPHRASE_WORDS,
-                f"Words per phrase must be between {MIN_PHRASE_WORDS} and {MAX_PHRASE_WORDS}")
+                f"Words per phrase must be between {MIN_PASSPHRASE_WORDS} and {MAX_PASSPHRASE_WORDS}")
     
-    words_per_phrase = max(MIN_PHRASE_WORDS, min(MAX_PHRASE_WORDS, words_per_phrase))
+    words_per_phrase = max(MIN_PASSPHRASE_WORDS, min(MAX_PASSPHRASE_WORDS, words_per_phrase))
     wordlist = get_wordlist()
     
     words = [secrets.choice(wordlist) for _ in range(words_per_phrase)]
@@ -83,10 +88,17 @@ def generate_phrase(words_per_phrase: int = DEFAULT_PHRASE_WORDS) -> str:
     return phrase
 
 
-def generate_day_phrases(words_per_phrase: int = DEFAULT_PHRASE_WORDS) -> Dict[str, str]:
+# Alias for backward compatibility and public API consistency
+generate_passphrase = generate_phrase
+
+
+def generate_day_phrases(words_per_phrase: int = DEFAULT_PASSPHRASE_WORDS) -> Dict[str, str]:
     """
     Generate phrases for all days of the week.
     
+    DEPRECATED in v3.2.0: Use generate_phrase() for single passphrase.
+    Kept for legacy compatibility and organizational use cases.
+    
     Args:
         words_per_phrase: Number of words per phrase (3-12)
         
@@ -97,6 +109,14 @@ def generate_day_phrases(words_per_phrase: int = DEFAULT_PHRASE_WORDS) -> Dict[s
         >>> generate_day_phrases(3)
         {'Monday': 'apple forest thunder', 'Tuesday': 'banana river lightning', ...}
     """
+    import warnings
+    warnings.warn(
+        "generate_day_phrases() is deprecated in v3.2.0. "
+        "Use generate_phrase() for single passphrase.",
+        DeprecationWarning,
+        stacklevel=2
+    )
+    
     phrases = {day: generate_phrase(words_per_phrase) for day in DAY_NAMES}
     debug.print(f"Generated phrases for {len(phrases)} days")
     return phrases
@@ -272,13 +292,89 @@ def generate_credentials(
     use_rsa: bool = False,
     pin_length: int = DEFAULT_PIN_LENGTH,
     rsa_bits: int = DEFAULT_RSA_BITS,
-    words_per_phrase: int = DEFAULT_PHRASE_WORDS
+    passphrase_words: int = DEFAULT_PASSPHRASE_WORDS,
+    rsa_password: Optional[str] = None,
 ) -> Credentials:
     """
     Generate a complete set of credentials.
     
+    v3.2.0: Now generates a single passphrase instead of daily phrases.
     At least one of use_pin or use_rsa must be True.
     
+    Args:
+        use_pin: Whether to generate a PIN
+        use_rsa: Whether to generate an RSA key
+        pin_length: PIN length if generating (default 6)
+        rsa_bits: RSA key size if generating (default 2048)
+        passphrase_words: Words in passphrase (default 4)
+        rsa_password: Optional password for RSA key encryption
+        
+    Returns:
+        Credentials object with passphrase, PIN, and/or RSA key
+        
+    Raises:
+        ValueError: If neither PIN nor RSA is selected
+        
+    Example:
+        >>> creds = generate_credentials(use_pin=True, use_rsa=False)
+        >>> creds.passphrase
+        "apple forest thunder mountain"
+        >>> creds.pin
+        "812345"
+    """
+    debug.validate(use_pin or use_rsa,
+                "Must select at least one security factor (PIN or RSA key)")
+    
+    if not use_pin and not use_rsa:
+        raise ValueError("Must select at least one security factor (PIN or RSA key)")
+    
+    debug.print(f"Generating credentials: PIN={use_pin}, RSA={use_rsa}, "
+                f"passphrase_words={passphrase_words}")
+    
+    # Generate single passphrase (v3.2.0 - no daily rotation)
+    passphrase = generate_phrase(passphrase_words)
+    
+    # Generate PIN if requested
+    pin = generate_pin(pin_length) if use_pin else None
+    
+    # Generate RSA key if requested
+    rsa_key_pem = None
+    if use_rsa:
+        rsa_key_obj = generate_rsa_key(rsa_bits)
+        rsa_key_pem = export_rsa_key_pem(rsa_key_obj, rsa_password).decode('utf-8')
+    
+    # Create Credentials object (v3.2.0 format with single passphrase)
+    creds = Credentials(
+        passphrase=passphrase,
+        pin=pin,
+        rsa_key_pem=rsa_key_pem,
+        rsa_bits=rsa_bits if use_rsa else None,
+        words_per_passphrase=passphrase_words,
+    )
+    
+    debug.print(f"Credentials generated: {creds.total_entropy} bits total entropy")
+    return creds
+
+
+# =============================================================================
+# LEGACY COMPATIBILITY
+# =============================================================================
+
+def generate_credentials_legacy(
+    use_pin: bool = True,
+    use_rsa: bool = False,
+    pin_length: int = DEFAULT_PIN_LENGTH,
+    rsa_bits: int = DEFAULT_RSA_BITS,
+    words_per_phrase: int = DEFAULT_PASSPHRASE_WORDS
+) -> dict:
+    """
+    Generate credentials in legacy format (v3.1.0 style with daily phrases).
+    
+    DEPRECATED: Use generate_credentials() for v3.2.0 format.
+    
+    This function exists only for migration tools that need to work with
+    old-format credentials.
+    
     Args:
         use_pin: Whether to generate a PIN
         use_rsa: Whether to generate an RSA key
@@ -287,44 +383,33 @@ def generate_credentials(
         words_per_phrase: Words per daily phrase
         
     Returns:
-        Credentials object
+        Dict with 'phrases' (dict), 'pin', 'rsa_key_pem', etc.
-        
-    Raises:
-        ValueError: If neither PIN nor RSA is selected
-        
-    Example:
-        >>> creds = generate_credentials(use_pin=True, use_rsa=False)
-        >>> creds.pin
-        "812345"
-        >>> creds.phrases['Monday']
-        "apple forest thunder"
     """
-    debug.validate(use_pin or use_rsa,
+    import warnings
-                "Must select at least one security factor (PIN or RSA key)")
+    warnings.warn(
+        "generate_credentials_legacy() returns v3.1.0 format. "
+        "Use generate_credentials() for v3.2.0 format.",
+        DeprecationWarning,
+        stacklevel=2
+    )
     
     if not use_pin and not use_rsa:
         raise ValueError("Must select at least one security factor (PIN or RSA key)")
     
-    debug.print(f"Generating credentials: PIN={use_pin}, RSA={use_rsa}, "
+    # Generate daily phrases (old format)
-                f"words={words_per_phrase}")
+    phrases = {day: generate_phrase(words_per_phrase) for day in DAY_NAMES}
-    
-    phrases = generate_day_phrases(words_per_phrase)
     
     pin = generate_pin(pin_length) if use_pin else None
     
     rsa_key_pem = None
-    rsa_key_obj = None
     if use_rsa:
         rsa_key_obj = generate_rsa_key(rsa_bits)
         rsa_key_pem = export_rsa_key_pem(rsa_key_obj).decode('utf-8')
     
-    creds = Credentials(
+    return {
-        phrases=phrases,
+        'phrases': phrases,
-        pin=pin,
+        'pin': pin,
-        rsa_key_pem=rsa_key_pem,
+        'rsa_key_pem': rsa_key_pem,
-        rsa_bits=rsa_bits if use_rsa else None,
+        'rsa_bits': rsa_bits if use_rsa else None,
-        words_per_phrase=words_per_phrase
+        'words_per_phrase': words_per_phrase,
-    )
+    }
-    
-    debug.print(f"Credentials generated: {creds.total_entropy} bits total entropy")
-    return creds

src/stegasoo/steganography.py

@@ -1,17 +1,21 @@
 """
-Stegasoo Steganography Functions (v3.0.1)
+Stegasoo Steganography Functions (v3.2.0)
 
 LSB and DCT embedding modes with pseudo-random pixel/coefficient selection.
 
-New in v3.0:
+Changes in v3.0:
 - DCT domain embedding mode (requires scipy)
 - embed_mode parameter for encode/decode
 - Auto-detection of embedding mode
 - Comparison utilities
 
-New in v3.0.1:
+Changes in v3.0.1:
 - dct_output_format parameter for DCT mode ('png' or 'jpeg')
 - dct_color_mode parameter for DCT mode ('grayscale' or 'color')
+
+Changes in v3.2.0:
+- Fixed HEADER_OVERHEAD constant (65 bytes, not 104 - date field removed)
+- Updated ENCRYPTION_OVERHEAD calculation
 """
 
 import io
@@ -51,10 +55,24 @@ EXT_TO_FORMAT = {
     'tif': 'TIFF',
 }
 
-# Overhead constants for capacity estimation
+# =============================================================================
-HEADER_OVERHEAD = 104  # Magic + version + date + salt + iv + tag
+# OVERHEAD CONSTANTS (v3.2.0 - Updated for date-independent format)
-LENGTH_PREFIX = 4      # 4 bytes for payload length
+# =============================================================================
-ENCRYPTION_OVERHEAD = HEADER_OVERHEAD + LENGTH_PREFIX
+# v3.2.0 Header format (no date field):
+#   Magic:   4 bytes  (\x89ST3)
+#   Version: 1 byte   (4 for v3.2.0)
+#   Salt:    32 bytes
+#   IV:      12 bytes
+#   Tag:     16 bytes
+#   -----------------
+#   Total:   65 bytes
+#
+# Previous v3.1.0 had date field (10 bytes + 1 byte length) = 76 bytes header
+# The old value of 104 was incorrect even for v3.1.0
+
+HEADER_OVERHEAD = 65       # v3.2.0: Magic + version + salt + iv + tag
+LENGTH_PREFIX = 4          # 4 bytes for payload length in LSB embedding
+ENCRYPTION_OVERHEAD = HEADER_OVERHEAD + LENGTH_PREFIX  # 69 bytes total
 
 # DCT output format options (v3.0.1)
 DCT_OUTPUT_PNG = 'png'
@@ -167,6 +185,9 @@ def will_fit(
     
     capacity = calculate_capacity(carrier_image, bits_per_channel)
     
+    # Estimate encrypted size with padding
+    # Padding adds 64-319 bytes, rounded up to 256-byte boundary
+    # Average case: ~190 bytes padding
     estimated_padding = 190
     estimated_encrypted_size = payload_size + estimated_padding + ENCRYPTION_OVERHEAD
     
@@ -175,7 +196,7 @@ def will_fit(
         try:
             import zlib
             compressed = zlib.compress(payload_data, level=6)
-            compressed_size = len(compressed) + 9
+            compressed_size = len(compressed) + 9  # Compression header
             if compressed_size < payload_size:
                 compressed_estimate = compressed_size
                 estimated_encrypted_size = compressed_size + estimated_padding + ENCRYPTION_OVERHEAD
@@ -301,7 +322,7 @@ def will_fit_by_mode(
         else:
             payload_size = len(payload)
         
-        estimated_size = payload_size + ENCRYPTION_OVERHEAD + 190
+        estimated_size = payload_size + ENCRYPTION_OVERHEAD + 190  # padding estimate
         
         dct_mod = _get_dct_module()
         fits = dct_mod.will_fit_dct(estimated_size, carrier_image)
@@ -481,8 +502,8 @@ def embed_in_image(
     bits_per_channel: int = 1,
     output_format: Optional[str] = None,
     embed_mode: str = EMBED_MODE_LSB,
-    dct_output_format: str = DCT_OUTPUT_PNG,  # NEW in v3.0.1
+    dct_output_format: str = DCT_OUTPUT_PNG,
-    dct_color_mode: str = 'grayscale',  # NEW in v3.0.1: 'grayscale' or 'color'
+    dct_color_mode: str = 'grayscale',
 ) -> Tuple[bytes, Union[EmbedStats, 'DCTEmbedStats'], str]:
     """
     Embed data into an image using specified mode.
@@ -535,7 +556,7 @@ def embed_in_image(
             image_data, 
             pixel_key,
             output_format=dct_output_format,
-            color_mode=dct_color_mode,  # NEW in v3.0.1
+            color_mode=dct_color_mode,
         )
         
         # Determine extension based on output format