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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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docs/TEMPLATES.md
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@@ -126,7 +126,7 @@ Quick reference for all Jinja2 templates in `frontends/web/templates/`.
- `use_pin` - checkbox
- `pin_length` - PIN digits (6-9)
- `use_rsa` - checkbox
- `rsa_bits` - key size (2048/3072/4096)
- `rsa_bits` - key size (2048/3072)
**Output panels:**
- Passphrase display