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SecNote — open-source E2EE read-once notes

SecNote is an open-source, zero-knowledge relay for sharing sensitive notes that should be opened only once. Notes are encrypted in the browser with AES-256-GCM before they leave the client, and the decryption key stays in the URL fragment so the server never receives it.

The backend stores only ciphertext in RAM, never writes note contents to disk, and atomically destroys each note after the first successful read or when it expires. No account is required.

Key features

• End-to-end encrypted notes with browser-side AES-256-GCM
• Read-once / burn-after-read delivery
• Zero-knowledge server that stores only ciphertext
• RAM-only storage with no persistent note database
• Accidental burn protection using a key-derived view token
• Proof-of-work anti-spam protection instead of traditional CAPTCHA
• Signed server responses with Ed25519 verification
• Public-key pinning / TOFU support for stronger trust boundaries
• No accounts, no login, no tracking workflow
• Self-hostable Rust backend
• Offline-capable static frontend with no CDN dependency
• Tor Browser-friendly design

SecNote is built for developers, security-conscious teams, journalists, administrators, and privacy-focused users who need a minimal way to exchange short secrets without relying on accounts, persistent storage, or server-side plaintext handling.