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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
CLI.md
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@@ -164,7 +164,7 @@ stegasoo generate [OPTIONS]
| `--pin/--no-pin` | | flag | `--pin` | Generate a PIN |
| `--rsa/--no-rsa` | | flag | `--no-rsa` | Generate an RSA key |
| `--pin-length` | | 6-9 | 6 | PIN length in digits |
| `--rsa-bits` | | choice | 2048 | RSA key size (2048, 3072, 4096) |
| `--rsa-bits` | | choice | 2048 | RSA key size (2048, 3072) |
| `--words` | | 3-12 | 4 | Words in passphrase |
| `--output` | `-o` | path | | Save RSA key to file |
| `--password` | `-p` | string | | Password for RSA key file |
@@ -180,7 +180,7 @@ stegasoo generate
stegasoo generate --words 6
# Generate with RSA key
stegasoo generate --rsa --rsa-bits 4096
stegasoo generate --rsa --rsa-bits 3072
# Save RSA key to encrypted file
stegasoo generate --rsa -o mykey.pem -p "mysecretpassword"