Secure message envelope demo

This page demonstrates how an app can send end-to-end encrypted chat over a relay (like Socket.IO): header + ciphertext. The server only sees the envelope, not the plaintext.

Message plaintext Conversation / Room ID Sender ID Recipient ID

Shared secret (demo)

In production this secret would come from a key agreement (e.g., X25519) and be rotated per session.

Envelope (what your server would relay)

Decrypted plaintext (receiver side)

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