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Cap RSA at 3072 bits, add zstd compression for QR codes

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- RSA key size capped at 3072 bits (4096 too large for QR codes)
- Added zstd compression for QR code RSA keys (better ratio than zlib)
- New prefix STEGASOO-ZS: for zstd, backward compatible with STEGASOO-Z: (zlib)
- Added zstandard dependency to web/api/compression extras
- Updated all docs, CLI options, and web UI to reflect 3072 max
- Version bump to 4.2.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Aaron D. Lee
2026-01-09 23:30:31 -05:00
parent 175362ce4c
commit 3fd3204552
13 changed files with 118 additions and 39 deletions
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4
frontends/cli/main.py
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@@ -236,7 +236,7 @@ def format_channel_status_line(quiet: bool = False) -> str | None:
help=f"PIN length (6-9, default: {DEFAULT_PIN_LENGTH})",
)
@click.option(
"--rsa-bits", type=click.Choice(["2048", "3072", "4096"]), default="2048", help="RSA key size"
"--rsa-bits", type=click.Choice(["2048", "3072"]), default="2048", help="RSA key size"
)
@click.option(
"--words",
@@ -261,7 +261,7 @@ def generate(pin, rsa, pin_length, rsa_bits, words, output, password, as_json):
Examples:
stegasoo generate
stegasoo generate --words 5
stegasoo generate --rsa --rsa-bits 4096
stegasoo generate --rsa --rsa-bits 3072
stegasoo generate --rsa -o mykey.pem -p "secretpassword"
stegasoo generate --no-pin --rsa
"""