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Add encrypted secret blocks (#111)

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Adds /secret markdown blocks that store passphrase-protected secrets as helix-secret fences and unlock in the editor. Uses WebCrypto PBKDF2-HMAC-SHA256 with 600k iterations plus AES-256-GCM with salt, nonce, and AAD-bound metadata because it is dependency-free, portable to simple JS/Python decryptors, and supported by browser/webview WebCrypto. Tradeoff: PBKDF2 is not memory-hard like Argon2id/scrypt, so protection depends on strong passphrases and the high iteration count.

Reviewed-on: https://codeberg.org/ArkHost/HelixNotes/pulls/111
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MF
2026-06-15 18:47:42 +02:00
committed by ArkHost
parent a94c33edaf
commit bc7c985489
3 changed files with 623 additions and 0 deletions
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README.md
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@@ -123,6 +123,7 @@ All releases: [codeberg.org/ArkHost/HelixNotes/releases](https://codeberg.org/Ar
- Outline panel, daily notes with calendar view, tags with autocomplete, drag-and-drop
- Live KaTeX math editor (`/math`, `/imath`) with modal preview, double-click to edit
- Mermaid diagrams (opt-in render, copy as PNG, save as PNG/SVG)
- Encrypted secret blocks (`/secret`) stored as portable `helix-secret` markdown fences
- Insert date/time (`/date`, `/time`, `/now`), color swatches (`/color`), configurable week start
- Manual notebook sorting (drag to reorder above, into, or below)
- External `.md` viewer mode with import-to-vault flow