Individual skill
implementing-end-to-end-encryption-for-messaging
Implements a simplified Signal Protocol-style end-to-end encryption scheme for messaging, covering key exchange, forward secrecy, and the core cryptographic components so no server or intermediary can decrypt messages. Use when designing or building E2EE messaging, or evaluating forward-secrecy and key-management tradeoffs for a messaging system.
skills/implementing-end-to-end-encryption-for-messaging/SKILL.md
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- Last checked
- Nov 9, 2026
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- Apache-2.0
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- ai-agents Repository topic
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- red-team Repository topic
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- cryptography Declared skill tag
- encryption Declared skill tag
- e2e Declared skill tag
- messaging Declared skill tag
- signal-protocol Declared skill tag
- engineering Derived category
- testing Derived category
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LICENSEasset · 11,255 bytesSKILL.mdcore · 3,369 bytesassets/template.mddoc · 1,468 bytesreferences/api-reference.mddoc · 1,890 bytesreferences/standards.mddoc · 1,467 bytesreferences/workflows.mddoc · 3,034 bytesscripts/agent.pyruns · 5,321 bytesscripts/process.pyruns · 12,729 bytes
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# Implementing End-to-End Encryption for Messaging
## Overview
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.
## When to Use
- When deploying or configuring implementing end to end encryption for messaging capabilities in your environment
- When establishing security controls aligned to compliance requirements
- When building or improving security architecture for this domain
- When conducting security assessments that require this implementation
## Prerequisites