Tiny Cryptography MCP Server

Tiny MCP server with cryptography tools, sufficient to establish end-to-end encryption between LLM agents. Exposed over MCP by the tiny cryptography mcp server, that capability becomes something an assistant can invoke while it works, not something you go and do afterwards.

What it actually does

A Model Context Protocol server built with Express.js that provides cryptographic tools including key pair generation, shared secret derivation, and message encryption/decryption.

The Model Context Protocol (MCP) is an open standard that defines how AI models and tools communicate. It enables seamless interoperability between language models and external capabilities, allowing AI systems to use tools more effectively. MCP standardizes the way models request information and actions, making it easier to build complex AI applications with multiple components.

• Generate SJCL P-256 key pairs
• Derive shared secrets for secure communication
• Encrypt messages using SJCL AES-CCM
• Decrypt encrypted messages
• Server-sent events (SSE) for real-time communication

Its toolset

Everything the assistant can do here goes through one of these:

• Messages — The Messages tool exposed by this server

Adding it to your client

Setup follows the usual MCP pattern — install or clone the server, register it in your client's configuration file, restart the client.

When to reach for it

Among the AI and media services options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. Tiny Cryptography's toolset — Messages — is a fair guide to whether it matches your workflow. It is maintained by anton10xr; worth a glance at recent repository activity before you build anything load-bearing on it.

This entry was verified against Tiny Cryptography's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.

Caveats

• It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
• MCP clients confirm each tool call by default. Leave that on until you have watched what the tiny cryptography mcp server does with a few real requests.