MCPS -- MCP Secure

Cryptographic identity, message signing, and trust verification for the Model Context Protocol.

The HTTPS of the agent era. MCP becomes MCPS.

Install

pip install mcp-secure

Quick Start

from mcp_secure import generate_key_pair, create_passport, sign_passport, verify_passport_signature
from mcp_secure import sign_message, verify_message, sign_tool, verify_tool

# Generate keys
keys = generate_key_pair()

# Create and sign a passport
passport = create_passport(
    name="my-agent",
    version="1.0.0",
    public_key=keys["public_key"],
    capabilities=["read", "write"],
)

# Trust Authority signs the passport
ta_keys = generate_key_pair()
signed = sign_passport(passport, ta_keys["private_key"])
assert verify_passport_signature(signed, ta_keys["public_key"])

# Sign MCP messages
envelope = sign_message(
    {"jsonrpc": "2.0", "method": "tools/list", "id": 1},
    signed["passport_id"],
    keys["private_key"],
)

# Verify
result = verify_message(envelope, keys["public_key"])
assert result["valid"]

# Tool integrity
tool = {"name": "read_file", "description": "Read a file", "inputSchema": {"type": "object"}}
sig = sign_tool(tool, keys["private_key"])
assert verify_tool(tool, sig, keys["public_key"])

What MCPS Adds to MCP

OWASP MCP Top 10

Mitigates 8/10 OWASP MCP vulnerabilities: tool poisoning, supply chain attacks, auth bypass, shadow servers, and more.

Links

• Website: mcp-secure.dev
• npm: mcp-secure
• Spec: SPEC.md

License

MIT -- CyberSecAI Ltd