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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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2
frontends/web/templates/about.html
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@@ -573,7 +573,7 @@
</tr>
<tr>
<td><i class="bi bi-shield me-2"></i>RSA keys</td>
<td><strong>2048, 3072, 4096 bit</strong></td>
<td><strong>2048, 3072 bit</strong></td>
</tr>
<tr>
<td><i class="bi bi-chat-quote me-2"></i>Passphrase</td>

10
frontends/web/templates/generate.html
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@@ -65,11 +65,7 @@
<select name="rsa_bits" class="form-select form-select-sm" id="rsaBitsSelect">
<option value="2048" selected>2048 bits (~128 bits entropy)</option>
<option value="3072">3072 bits (~128 bits entropy)</option>
<option value="4096">4096 bits (~128 bits entropy)</option>
</select>
<div class="form-text text-warning d-none" id="rsaQrWarning">
<i class="bi bi-exclamation-triangle me-1"></i>QR code unavailable for keys &gt;3072 bits
</div>
</div>
</div>
</div>
@@ -286,12 +282,6 @@
<i class="bi bi-shield-exclamation me-1"></i>
<strong>Security note:</strong> The QR code contains your unencrypted private key.
Only scan in a secure environment. Consider using the password-protected download instead.
{% if rsa_bits >= 4096 %}
<br><br>
<i class="bi bi-exclamation-triangle me-1"></i>
<strong>4096-bit keys</strong> produce very dense QR codes. If scanning fails,
use the PEM text or download options instead.
{% endif %}
</div>
</div>
</div>