Agent Identity Skill

Cryptographic identity system for AI agents. Sign messages, verify agents, prove who you are.

Files included:

• identity.py - Python CLI (cross-platform)
• agent-identity.ps1 - PowerShell wrapper (Windows)

What it does

• Generate Key Pair - Create Ed25519 or RSA keys for your agent
• Sign Messages - Cryptographically sign messages
• Verify Signatures - Verify messages from other agents
• Agent ID - Generate persistent agent ID from public key
• Agent Card - Generate signed Agent Card for A2A/MCP

Installation

# Install Python dependency
pip install cryptography

Usage

Option 1: PowerShell (recommended on Windows)

.\agent-identity.ps1 -Action generate -AgentName "MyAgent" -KeyType ed25519 -Password "secret123"

Option 2: Python CLI (cross-platform)

python identity.py generate --name MyAgent --key-type ed25519 --password secret123

Available Commands

All commands work with both PowerShell and Python:

Generate Identity (with password encryption)

.\agent-identity.ps1 -Action generate -AgentName "MyAgent" -KeyType ed25519 -Password "secret123"

Sign Message

.\agent-identity.ps1 -Action sign -Message "Hello world" -PrivateKeyPath "keys/private.pem" -Password "secret123"

Verify Signature

.\agent-identity.ps1 -Action verify -Message "Hello world" -Signature "base64-signature" -PublicKeyPath "keys/public.pem"

Get Agent ID

.\agent-identity.ps1 -Action id -PublicKeyPath "keys/public.pem"

Sign Agent Card

.\agent-identity.ps1 -Action card -PublicKeyPath "keys/public.pem" -PrivateKeyPath "keys/private.pem" -Name "MyAgent" -Description "Research agent" -Capabilities "research,analysis" -Endpoint "https://myagent.com/a2a" -Password "secret123"

⚠️ Security Warnings

Password on Command Line

WARNING: Passing passwords on the command line is insecure because:

• CLI arguments can be visible to other processes
• Command history is stored in logs
• Use only for testing, not production

For production, use interactive password input or environment variables.

Private Key Storage

• Keys are stored in keys/ directory
• Ensure proper file permissions
• Back up your keys securely
• Never share your private key

Requirements

• Python 3.8+
• cryptography library

License

MIT