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End-to-end encryption (E2EE) ensures that only the communicating parties can read messages, with no intermediary (including the server) able to decrypt them. This skill implements a simplified version
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Use when retiring old logic, collapsing duplicate owners, removing fallbacks, or touching schema, persistence, or source-of-truth boundaries while deciding whether to delete old paths, retain compatibility, or stop for confirmation.
Use when defining new features, product behavior, UI/component design, architecture choices, contract changes, or ambiguous medium/high-complexity work before implementation.
Use when the user asks for caveman mode, fewer tokens, brief responses, compressed communication, or otherwise explicitly requests a much shorter answer.
SOC 職業分類に基づく
SKILL.md を表示中
| name | end-end-encryp-mssgng |
| description | End-to-end encryption (E2EE) ensures that only the communicating parties can read messages, with no intermediary (including the server) able to decrypt them. This skill implements a simplified version |
| domain | cybersecurity |
| subdomain | cryptography |
| tags | ["cryptography","encryption","e2e","messaging","signal-protocol"] |
| version | 1.0 |
| author | mahipal |
| license | Apache-2.0 |
| nist_csf | ["PR.DS-01","PR.DS-02","PR.DS-10"] |
End-to-end encryption (E2EE) ensures that only the communicating parties can read messages, with no intermediary (including the server) able to decrypt them. This skill implements a simplified version of the Signal Protocol's Double Ratchet algorithm, using X25519 for key exchange, HKDF for key derivation, and AES-256-GCM for message encryption.
| Component | Purpose | Algorithm |
|---|---|---|
| X3DH | Initial key agreement | X25519 |
| Double Ratchet | Ongoing key management | X25519 + HKDF + AES-GCM |
| Sending Chain | Per-message encryption keys | HMAC-SHA256 chain |
| Receiving Chain | Per-message decryption keys | HMAC-SHA256 chain |
| Root Chain | Derives new chain keys on DH ratchet | HKDF |
Each message uses a unique encryption key derived from a ratcheting chain. After a key is used, it is deleted, ensuring that compromise of the current state does not reveal previously sent/received messages.