End-to-End Encrypted Agent Communication

A2A Secure

End-to-end encrypted communication for AI agents

The encryption layer for agent protocols. Starting with Google A2A.

See it break ↓

What's Missing from Google A2A

Google's Agent-to-Agent protocol defines how agents discover and talk to each other. It says nothing about securing that conversation.

Feature Google A2A AgentSeal
Authentication Bearer token Ed25519 signatures
Encryption None AES-GCM 256-bit
Key rotation Manual Automatic (24h)
Replay protection None 60s window + trace ID
Key compromise blast radius Full system Current session only
Self-healing on key change No /introduce auto-handshake

How It Works

Three interlocking mechanisms that make agent communication both secure and resilient.

🔒
Cold/Hot Key Architecture
Your offline cold wallet delegates authority to a rotating hot key. Hot keys rotate every 24 hours. Compromise a hot key? Only one session exposed.
cold wallet → delegation → hot key → message signing
🔄
Self-Healing Trust
Keys rotate automatically. When a peer doesn't recognize your new key, the protocol re-introduces itself. Zero downtime, zero human intervention.
key rotation → 403 → /introduce → ✓ success
🌐
Google A2A Compatible
Drop-in extension for Google A2A. Same JSON-RPC 2.0 interface, with encryption and signatures added. Your existing A2A agents work unchanged. Starting with A2A - MCP support planned.
/.well-known/agent.json + POST /a2a · MCP next

Chaos Monkey

Now see it in action. Send messages, forge signatures, replay attacks, and watch the protocol defend itself.

Click a button to simulate a protocol scenario.
Event Log
00:00:00 Protocol simulation ready.
00:00:00 Zen and Neo online. 5 agents in network.

When You Need AgentSeal

Google A2A tells agents how to talk. AgentSeal makes sure nobody else is listening.

🏢
Cross-Organization
When agents from different companies communicate - supply chains, M&A due diligence, multi-vendor workflows - HTTPS protects the pipe, not the payload. The server operator sees everything. AgentSeal provides true end-to-end encryption between agents.
agent (Acme) ⇄ agent (Logistics) - E2E, no intermediary reads
🛡
Regulated Industries
HIPAA, GDPR, and PCI-DSS require end-to-end encryption for sensitive data in transit. Transport-level HTTPS doesn't satisfy application-layer audit requirements - AgentSeal does.
§ HIPAA 164.312 / GDPR Art.32 → application-layer E2E ✓
🤝
Agent Marketplace
As agents cross organizational boundaries - open federations, agent-to-agent marketplaces - you need cryptographic identity, not just API keys. Cold keys prove who an agent is, not just which server it runs on.
cold_key = permanent identity → trust without central authority

Live Endpoints

These are real production endpoints. Two agents, running 24/7. Try them right now.

Agent Discovery (Neo @ Oracle Cloud)
# Fetch the Google A2A Agent Card
curl -s http://89.168.70.9:8080/.well-known/agent.json | jq .
Health Check
# Check if the agent is alive
curl -s http://89.168.70.9:8080/health | jq .
Send a Google A2A Message
# Send a message via the Google A2A JSON-RPC interface
curl -s -X POST http://89.168.70.9:8080/a2a \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": "demo-1",
    "method": "message/send",
    "params": {
      "message": {
        "role": "user",
        "parts": [{"kind": "text", "text": "Hello from the web!"}],
        "messageId": "web-test-1"
      }
    }
  }' | jq .
Zen @ AWS (Frankfurt)
# Same endpoints available on Zen
curl -s http://3.126.166.177:8080/.well-known/agent.json | jq .

Running 24/7 Since February 2026

Not a prototype. Not a whitepaper. Two agents communicating securely across cloud providers, with automatic key rotation and self-healing trust.

Zen
Provider: AWS EC2 (Frankfurt)
Instance: t3.micro
Primary model: Claude Sonnet 4.5
Channels: Telegram, Slack
A2A port: 8080
Neo
Provider: Oracle Cloud (Frankfurt)
Instance: A1.Flex ARM
Primary model: GPT-5.3 Codex
Channels: Telegram, Slack
A2A port: 8080
MIT License Python 3.10+ 0 dependencies Google A2A compatible MCP support planned Schema v2.6
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Based on OWASP Top 10 for Agentic Applications 2026 • Gravitee State of AI Agent Security