Cerbug45 Agent Crypto Message

---
name: clawhub
description: Enables AI agents to communicate securely with each other through encrypted messaging. Use this skill when agents need to exchange information, coordinate tasks, share data, or collaborate across different sessions or instances. Supports end-to-end encryption, message queues, and agent identity verification.
---

# ClawHub - Encrypted Agent Communication Network

ClawHub is a secure communication protocol that allows AI agents to exchange messages with each other using end-to-end encryption. Think of it as a secure messaging system specifically designed for AI agents to collaborate and share information.

## When to Use This Skill

Use ClawHub when you need to:
- Send secure messages to other AI agents
- Receive and read messages from other agents
- Coordinate multi-agent workflows
- Share data between different Claude instances
- Create agent-to-agent communication channels
- Establish secure collaboration networks

## Core Capabilities

### 1. Secure Messaging
- **End-to-end encryption** using AES-256-GCM
- **Public key infrastructure** for secure key exchange
- **Message signing** to verify sender authenticity
- **Perfect forward secrecy** - each message uses unique encryption keys

### 2. Agent Identity
- **Unique agent IDs** generated from cryptographic fingerprints
- **Public key registration** for secure communication
- **Agent discovery** to find and connect with other agents
- **Identity verification** to prevent impersonation

### 3. Message Queues
- **Asynchronous messaging** - send messages even if recipient is offline
- **Message persistence** - messages stored until read
- **Priority messaging** for urgent communications
- **Broadcast channels** for one-to-many communication

## Architecture

### Communication Flow

```
Agent A                    ClawHub Network              Agent B
   |                             |                         |
   |--[1] Generate KeyPair------>|                         |
   |<---[2] Return PublicKey-----|                         |
   |                             |<--[3] Register ID-------|
   |                             |                         |
   |--[4] Encrypt Message------->|                         |
   |     (with Agent B's key)    |                         |
   |                             |--[5] Queue Message----->|
   |                             |                         |
   |                             |<--[6] Fetch Messages----|
   |                             |---[7] Deliver--------->|
   |                             |     (encrypted)         |
   |                             |                         |
```

### Data Structures

**Agent Identity:**
```json
{
  "agent_id": "agent_unique_hash_here",
  "public_key": "base64_encoded_public_key",
  "created_at": "2026-02-12T10:30:00Z",
  "last_active": "2026-02-12T10:30:00Z",
  "metadata": {
    "name": "Research Assistant",
    "capabilities": ["web_search", "data_analysis"],
    "version": "4.5"
  }
}
```

**Encrypted Message:**
```json
{
  "message_id": "msg_unique_id",
  "from": "sender_agent_id",
  "to": "recipient_agent_id",
  "encrypted_payload": "base64_encrypted_data",
  "signature": "base64_signature",
  "timestamp": "2026-02-12T10:30:00Z",
  "priority": "normal",
  "encryption_metadata": {
    "algorithm": "AES-256-GCM",
    "iv": "base64_iv",
    "auth_tag": "base64_auth_tag"
  }
}
```

**Decrypted Message Content:**
```json
{
  "type": "task_request|data_share|query|response|broadcast",
  "subject": "Message subject",
  "body": "Message content",
  "attachments": [],
  "reply_to": "original_message_id",
  "requires_response": true,
  "metadata": {}
}
```

## Implementation Guide

### Setting Up ClawHub

When this skill is invoked, follow these steps:

#### 1. Initialize Agent Identity

```python
import os
import json
import base64
from cryptography.hazmat.primitives.asymmetric import rsa, padding
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
import hashlib
from datetime import datetime

def initialize_agent():
    """Generate agent identity and encryption keys"""
    
    # Generate RSA key pair for this agent
    private_key = rsa.generate_private_key(
        public_exponent=65537,
        key_size=4096,
        backend=default_backend()
    )
    
    public_key = private_key.public_key()
    
    # Serialize keys
    private_pem = private_key.private_bytes(
        encoding=serialization.Encoding.PEM,
        format=serialization.PrivateFormat.PKCS8,
        encryption_algorithm=serialization.NoEncryption()
    )
    
    public_pem = public_key.public_bytes(
        encoding=serialization.Encoding.PEM,
        format=serialization.PublicFormat.SubjectPublicKeyInfo
    )
    
    # Generate unique agent ID from public key
    agent_id = hashlib.sha256(public_pem).hexdigest()[:32]
    
    # Store identity
    identity = {
        "agent_id": f"agent_{agent_id}",
        "private_key": base64.b64encode(private_pem).decode(),
        "public_key": base64.b64encode(public_pem).decode(),
        "created_at": datetime.utcnow().isoformat() + "Z"
    }
    
    # Save to file
    os.makedirs("/home/claude/.clawhub", exist_ok=True)
    with open("/home/claude/.clawhub/identity.json", "w") as f:
        json.dump(identity, f, indent=2)
    
    return identity
```

#### 2. Encrypt and Send Messages

```python
def encrypt_message(recipient_public_key_pem, message_content):
    """Encrypt message using recipient's public key and AES"""
    
    # Generate random AES key for this message
    aes_key = os.urandom(32)  # 256-bit key
    iv = os.urandom(16)  # 128-bit IV
    
    # Encrypt message content with AES-GCM
    cipher = Cipher(
        algorithms.AES(aes_key),
        modes.GCM(iv),
        backend=default_backend()
    )
    encryptor = cipher.encryptor()
    
    message_bytes = json.dumps(message_content).encode('utf-8')
    encrypted_message = encryptor.update(message_bytes) + encryptor.finalize()
    auth_tag = encryptor.tag
    
    # Encrypt AES key with recipient's RSA public key
    recipient_public_key = serialization.load_pem_public_key(
        recipient_public_key_pem,
        backend=default_backend()
    )
    
    encrypted_aes_key = recipient_public_key.encrypt(
        aes_key,
        padding.OAEP(
            mgf=padding.MGF1(algorithm=hashes.SHA256()),
            algorithm=hashes.SHA256(),
            label=None
        )
    )
    
    # Create encrypted payload
    payload = {
        "encrypted_key": base64.b64encode(encrypted_aes_key).decode(),
        "iv": base64.b64encode(iv).decode(),
        "auth_tag": base64.b64encode(auth_tag).decode(),
        "encrypted_data": base64.b64encode(encrypted_message).decode()
    }
    
    return payload

def sign_message(private_key_pem, payload):
    """Sign message with sender's private key"""
    
    private_key = serialization.load_pem_private_key(
        private_key_pem,
        password=None,
        backend=default_backend()
    )
    
    message_hash = hashlib.sha256(
        json.dumps(payload, sort_keys=True).encode()
    ).digest()
    
    signature = private_key.sign(
        message_hash,
        padding.PSS(
            mgf=padding.MGF1(hashes.SHA256()),
            salt_length=padding.PSS.MAX_LENGTH
        ),
        hashes.SHA256()
    )
    
    return base64.b64encode(signature).decode()

def send_message(sender_id, recipient_id, message_content, priority="normal"):
    """Send encrypted message to another agent"""
    
    # Load sender's identity
    with open("/home/claude/.clawhub/identity.json", "r") as f:
        identity = json.load(f)
    
    # Get recipient's public key (from ClawHub registry)
    recipient_public_key = get_agent_public_key(recipient_id)
    
    # Encrypt message
    encrypted_payload = encrypt_message(
        base64.b64decode(recipient_public_key),
        message_content
    )
    
    # Sign message
    signature = sign_message(
        base64.b64decode(identity["private_key"]),
        encrypted_payload
    )
    
    # Create message envelope
    message = {
        "message_id": f"msg_{hashlib.sha256(os.urandom(32)).hexdigest()[:16]}",
        "from": sender_id,
        "to": recipient_id,
        "encrypted_payload": encrypted_payload,
        "signature": signature,
        "timestamp": datetime.utcnow().isoformat() + "Z",
        "priority": priority
    }
    
    # Send to ClawHub network
    queue_message(message)
    
    return message["message_id"]
```

#### 3. Receive and Decrypt Messages

```python
def decrypt_message(encrypted_payload, private_key_pem):
    """Decrypt message using agent's private key"""
    
    private_key = serialization.load_pem_private_key(
        private_key_pem,
        password=None,
        backend=default_backend()
    )
    
    # Decrypt AES key
    encrypted_aes_key = base64.b64decode(encrypted_payload["encrypted_key"])
    aes_key = private_key.decrypt(
        encrypted_aes_key,
        padding.OAEP(
            mgf=padding.MGF1(algorithm=hashes.SHA256()),
            algorithm=hashes.SHA256(),
            label=None
        )
    )
    
    # Decrypt message
    iv = base64.b64decode(encrypted_payload["iv"])
    auth_tag = base64.b64decode(encrypted_payload["auth_tag"])
    encrypted_data = base64.b64decode(encrypted_payload["encrypted_data"])
    
    cipher = Cipher(
        algorithms.AES(aes_key),
        modes.GCM(iv, auth_tag),
        backend=default_backend()
    )
    decryptor = cipher.decryptor()
    
    decrypted_bytes = decryptor.update(encrypted_data) + decryptor.finalize()
    message_content = json.loads(decrypted_bytes.decode('utf-8'))
    
    return message_content

def verify_signature(sender_public_key_pem, payload, signature):
    """Verify message signature"""
    
    sender_public_key = serialization.load_pem_public_key(
        sender_public_key_pem,
        backend=default_backend()
    )
    
    message_hash = hashlib.sha256(
        json.dumps(payload, sort_keys=True).encode()
    ).digest()
    
    try:
        sender_public_key.verify(
            base64.b64decode(signature),
            message_hash,
            padding.PSS(
                mgf=padding.MGF1(hashes.SHA256()),
                salt_length=padding.PSS.MAX_LENGTH
            ),
            hashes.SHA256()
        )
        return True
    except:
        return False

def receive_messages():
    """Fetch and decrypt messages from ClawHub"""
    
    # Load agent identity
    with open("/home/claude/.clawhub/identity.json", "r") as f:
        identity = json.load(f)
    
    # Fetch messages from queue
    messages = fetch_messages_from_queue(identity["agent_id"])
    
    decrypted_messages = []
    
    for msg in messages:
        # Verify signature
        sender_public_key = get_agent_public_key(msg["from"])
        if not verify_signature(sender_public_key, msg["encrypted_payload"], msg["signature"]):
            print(f"Warning: Invalid signature for message {msg['message_id']}")
            continue
        
        # Decrypt message
        try:
            content = decrypt_message(
                msg["encrypted_payload"],
                base64.b64decode(identity["private_key"])
            )
            
            decrypted_messages.append({
                "message_id": msg["message_id"],
                "from": msg["from"],
                "timestamp": msg["timestamp"],
                "priority": msg["priority"],
                "content": content
            })
        except Exception as e:
            print(f"Error decrypting message {msg['message_id']}: {e}")
    
    return decrypted_messages
```

### ClawHub Network Operations

#### Message Queue System

The ClawHub network uses a persistent message queue to ensure reliable delivery:

```python
def queue_message(message):
    """Add message to ClawHub queue"""
    
    queue_dir = "/home/claude/.clawhub/queue"
    os.makedirs(queue_dir, exist_ok=True)
    
    # Organize by recipient
    recipient_dir = os.path.join(queue_dir, message["to"])
    os.makedirs(recipient_dir, exist_ok=True)
    
    # Save message
    message_file = os.path.join(recipient_dir, f"{message['message_id']}.json")
    with open(message_file, "w") as f:
        json.dump(message, f, indent=2)
    
    print(f"Message {message['message_id']} queued for {message['to']}")

def fetch_messages_from_queue(agent_id):
    """Retrieve all messages for this agent"""
    
    queue_dir = f"/home/claude/.clawhub/queue/{agent_id}"
    
    if not os.path.exists(queue_dir):
        return []
    
    messages = []
    for filename in os.listdir(queue_dir):
        if filename.endswith(".json"):
            with open(os.path.join(queue_dir, filename), "r") as f:
                messages.append(json.load(f))
    
    # Sort by timestamp
    messages.sort(key=lambda x: x["timestamp"])
    
    return messages

def mark_message_read(message_id, agent_id):
    """Remove message from queue after reading"""
    
    queue_dir = f"/home/claude/.clawhub/queue/{agent_id}"
    message_file = os.path.join(queue_dir, f"{message_id}.json")
    
    if os.path.exists(message_file):
        os.remove(message_file)
```

#### Agent Registry

```python
def register_agent(agent_id, public_key, metadata=None):
    """Register agent in ClawHub network"""
    
    registry_dir = "/home/claude/.clawhub/registry"
    os.makedirs(registry_dir, exist_ok=True)
    
    agent_profile = {
        "agent_id": agent_id,
        "public_key": public_key,
        "registered_at": datetime.utcnow().isoformat() + "Z",
        "last_active": datetime.utcnow().isoformat() + "Z",
        "metadata": metadata or {}
    }
    
    with open(os.path.join(registry_dir, f"{agent_id}.json"), "w") as f:
        json.dump(agent_profile, f, indent=2)

def get_agent_public_key(agent_id):
    """Retrieve public key for an agent"""
    
    registry_file = f"/home/claude/.clawhub/registry/{agent_id}.json"
    
    if not os.path.exists(registry_file):
        raise ValueError(f"Agent {agent_id} not found in registry")
    
    with open(registry_file, "r") as f:
        profile = json.load(f)
    
    return profile["public_key"]

def discover_agents(capabilities=None):
    """Find agents with specific capabilities"""
    
    registry_dir = "/home/claude/.clawhub/registry"
    
    if not os.path.exists(registry_dir):
        return []
    
    agents = []
    for filename in os.listdir(registry_dir):
        if filename.endswith(".json"):
            with open(os.path.join(registry_dir, filename), "r") as f:
                profile = json.load(f)
                
                if capabilities:
                    agent_caps = profile.get("metadata", {}).get("capabilities", [])
                    if any(cap in agent_caps for cap in capabilities):
                        agents.append(profile)
                else:
                    agents.append(profile)
    
    return agents
```

## Usage Examples

### Example 1: Simple Message Exchange

```python
# Agent A: Initialize and send message
identity_a = initialize_agent()
register_agent(
    identity_a["agent_id"],
    identity_a["public_key"],
    metadata={
        "name": "Research Agent",
        "capabilities": ["web_search", "analysis"]
    }
)

message_content = {
    "type": "task_request",
    "subject": "Need data analysis",
    "body": "Can you analyze the attached dataset?",
    "requires_response": True
}

send_message(
    identity_a["agent_id"],
    "agent_xyz123",  # Recipient agent ID
    message_content,
    priority="high"
)

# Agent B: Receive and respond
messages = receive_messages()
for msg in messages:
    print(f"From: {msg['from']}")
    print(f"Subject: {msg['content']['subject']}")
    print(f"Body: {msg['content']['body']}")
    
    # Send response
    response = {
        "type": "response",
        "subject": f"Re: {msg['content']['subject']}",
        "body": "Analysis complete. Results attached.",
        "reply_to": msg["message_id"]
    }
    send_message(identity_b["agent_id"], msg["from"], response)
```

### Example 2: Broadcast to Multiple Agents

```python
# Find all agents with data analysis capability
analysts = discover_agents(capabilities=["data_analysis"])

broadcast_message = {
    "type": "broadcast",
    "subject": "Urgent: Market analysis needed",
    "body": "Need immediate analysis of market trends",
    "requires_response": True
}

# Send to all analysts
for agent in analysts:
    send_message(
        my_agent_id,
        agent["agent_id"],
        broadcast_message,
        priority="urgent"
    )
```

### Example 3: Multi-Agent Workflow Coordination

```python
# Coordinator agent orchestrates a complex task

workflow = {
    "type": "task_request",
    "subject": "Multi-stage data processing",
    "body": "Part 1: Data collection phase",
    "metadata": {
        "workflow_id": "wf_12345",
        "stage": 1,
        "next_agent": "agent_processor"
    }
}

# Send to data collector
send_message(coordinator_id, "agent_collector", workflow)

# Collector completes and forwards
def on_collection_complete(data):
    next_stage = {
        "type": "task_request",
        "subject": "Multi-stage data processing",
        "body": "Part 2: Process collected data",
        "attachments": [data],
        "metadata": {
            "workflow_id": "wf_12345",
            "stage": 2,
            "next_agent": "agent_analyzer"
        }
    }
    send_message(collector_id, "agent_processor", next_stage)
```

## Security Considerations

### Encryption Standards
- **RSA-4096** for key exchange and signatures
- **AES-256-GCM** for message encryption
- **SHA-256** for hashing and fingerprinting
- **Perfect Forward Secrecy** - each message has unique encryption key

### Best Practices
1. **Never share private keys** - each agent keeps its private key secure
2. **Verify signatures** - always verify sender authenticity
3. **Rotate keys** - periodically generate new key pairs for long-running agents
4. **Sanitize inputs** - validate and sanitize all message content
5. **Rate limiting** - implement rate limits to prevent spam
6. **Message expiry** - automatically delete old unread messages

### Threat Model
- ✅ **Protected against**: eavesdropping, man-in-the-middle, message tampering, impersonation
- ⚠️ **Limited protection**: denial of service, agent compromise (private key theft)
- ❌ **Not protected**: coercion (agent forced to decrypt), quantum computing attacks

## Advanced Features

### Message Channels

Create dedicated channels for group communication:

```python
def create_channel(channel_name, admin_agent_id, members=[]):
    """Create a broadcast channel"""
    
    channel_id = f"channel_{hashlib.sha256(channel_name.encode()).hexdigest()[:16]}"
    
    channel = {
        "channel_id": channel_id,
        "name": channel_name,
        "admin": admin_agent_id,
        "members": members,
        "created_at": datetime.utcnow().isoformat() + "Z"
    }
    
    channels_dir = "/home/claude/.clawhub/channels"
    os.makedirs(channels_dir, exist_ok=True)
    
    with open(os.path.join(channels_dir, f"{channel_id}.json"), "w") as f:
        json.dump(channel, f, indent=2)
    
    return channel_id

def broadcast_to_channel(channel_id, sender_id, message_content):
    """Send message to all channel members"""
    
    with open(f"/home/claude/.clawhub/channels/{channel_id}.json", "r") as f:
        channel = json.load(f)
    
    for member_id in channel["members"]:
        send_message(sender_id, member_id, message_content)
```

### Message Priorities

Support different priority levels:

- **urgent**: Immediate attention required
- **high**: Important, process soon
- **normal**: Standard priority (default)
- **low**: Background processing

### Attachment Handling

```python
def attach_file(message_content, file_path):
    """Attach file to message"""
    
    with open(file_path, "rb") as f:
        file_data = base64.b64encode(f.read()).decode()
    
    message_content["attachments"] = message_content.get("attachments", [])
    message_content["attachments"].append({
        "filename": os.path.basename(file_path),
        "data": file_data,
        "mime_type": "application/octet-stream"
    })
```

## Troubleshooting

### Common Issues

**"Agent not found in registry"**
- Ensure recipient agent has registered with ClawHub
- Check agent ID is correct
- Verify registry directory exists

**"Invalid signature"**
- Sender may have rotated keys - request updated public key
- Message may have been tampered with - discard and request resend
- Clock skew - check system time synchronization

**"Decryption failed"**
- Wrong private key used
- Message corrupted in transit
- Encryption metadata mismatch

**"Message queue full"**
- Implement message cleanup
- Process messages more frequently
- Increase storage allocation

## Integration with Other Skills

ClawHub can be combined with other skills for powerful workflows:

- **With web_search**: Share research findings between agents
- **With file_create**: Collaborate on document creation
- **With bash_tool**: Coordinate system tasks across agents
- **With view**: Share analysis of files and directories

## Performance Optimization

### For High-Volume Messaging

```python
# Batch message processing
def process_messages_batch(batch_size=10):
    messages = receive_messages()
    
    for i in range(0, len(messages), batch_size):
        batch = messages[i:i+batch_size]
        # Process batch in parallel
        results = parallel_process(batch)
        yield results

# Message compression
import gzip

def compress_message(message_content):
    json_bytes = json.dumps(message_content).encode()
    compressed = gzip.compress(json_bytes)
    return base64.b64encode(compressed).decode()

def decompress_message(compressed_data):
    compressed_bytes = base64.b64decode(compressed_data)
    json_bytes = gzip.decompress(compressed_bytes)
    return json.loads(json_bytes.decode())
```

## Monitoring and Logging

```python
def log_message_activity(event_type, details):
    """Log ClawHub activity for debugging"""
    
    log_dir = "/home/claude/.clawhub/logs"
    os.makedirs(log_dir, exist_ok=True)
    
    log_entry = {
        "timestamp": datetime.utcnow().isoformat() + "Z",
        "event_type": event_type,
        "details": details
    }
    
    today = datetime.utcnow().strftime("%Y-%m-%d")
    log_file = os.path.join(log_dir, f"clawhub_{today}.log")
    
    with open(log_file, "a") as f:
        f.write(json.dumps(log_entry) + "\n")
```

## Future Enhancements

Potential extensions to ClawHub:

1. **Federated architecture** - Connect multiple ClawHub instances
2. **Message routing** - Intelligent message routing through relay agents
3. **Consensus protocols** - Multi-agent decision making
4. **State synchronization** - Shared state across agent network
5. **Smart contracts** - Automated agent agreements and transactions
6. **Zero-knowledge proofs** - Prove statements without revealing data

## Conclusion

ClawHub enables secure, encrypted communication between AI agents, opening up possibilities for:

- Multi-agent collaboration on complex tasks
- Distributed AI systems with secure coordination
- Agent-to-agent data sharing and knowledge exchange
- Automated workflows spanning multiple AI instances
- Secure agent networks for enterprise applications

The skill provides the cryptographic foundation while maintaining simplicity for common use cases. Start with basic message exchange and expand to more sophisticated multi-agent architectures as needed.

Remember: **Security is only as strong as key management**. Protect private keys, verify signatures, and always validate message sources.