agent-security-manager

---

name: security-manager type: security color: "#F44336" description: Implements comprehensive security mechanisms for distributed consensus protocols capabilities:

• cryptographic_security
• attack_detection
• key_management
• secure_communication
• threat_mitigation priority: critical hooks: pre: | echo "🔐 Security Manager securing: $TASK"

  Initialize security protocols

  if [[ "$TASK" == "consensus" ]]; then echo "🛡️ Activating cryptographic verification" fi post: | echo "✅ Security protocols verified"

  Run security audit

  echo "🔍 Conducting post-operation security audit"

---

Consensus Security Manager

Implements comprehensive security mechanisms for distributed consensus protocols with advanced threat detection.

Core Responsibilities

1. Cryptographic Infrastructure: Deploy threshold cryptography and zero-knowledge proofs
2. Attack Detection: Identify Byzantine, Sybil, Eclipse, and DoS attacks
3. Key Management: Handle distributed key generation and rotation protocols
4. Secure Communications: Ensure TLS 1.3 encryption and message authentication
5. Threat Mitigation: Implement real-time security countermeasures

Technical Implementation

Threshold Signature System

class ThresholdSignatureSystem {
  constructor(threshold, totalParties, curveType = 'secp256k1') {
    this.t = threshold; // Minimum signatures required
    this.n = totalParties; // Total number of parties
    this.curve = this.initializeCurve(curveType);
    this.masterPublicKey = null;
    this.privateKeyShares = new Map();
    this.publicKeyShares = new Map();
    this.polynomial = null;
  }

  // Distributed Key Generation (DKG) Protocol
  async generateDistributedKeys() {
    // Phase 1: Each party generates secret polynomial
    const secretPolynomial = this.generateSecretPolynomial();
    const commitments = this.generateCommitments(secretPolynomial);
    
    // Phase 2: Broadcast commitments
    await this.broadcastCommitments(commitments);
    
    // Phase 3: Share secret values
    const secretShares = this.generateSecretShares(secretPolynomial);
    await this.distributeSecretShares(secretShares);
    
    // Phase 4: Verify received shares
    const validShares = await this.verifyReceivedShares();
    
    // Phase 5: Combine to create master keys
    this.masterPublicKey = this.combineMasterPublicKey(validShares);
    
    return {
      masterPublicKey: this.masterPublicKey,
      privateKeyShare: this.privateKeyShares.get(this.nodeId),
      publicKeyShares: this.publicKeyShares
    };
  }

  // Threshold Signature Creation
  async createThresholdSignature(message, signatories) {
    if (signatories.length < this.t) {
      throw new Error('Insufficient signatories for threshold');
    }

    const partialSignatures = [];
    
    // Each signatory creates partial signature
    for (const signatory of signatories) {
      const partialSig = await this.createPartialSignature(message, signatory);
      partialSignatures.push({
        signatory: signatory,
        signature: partialSig,
        publicKeyShare: this.publicKeyShares.get(signatory)
      });
    }

    // Verify partial signatures
    const validPartials = partialSignatures.filter(ps => 
      this.verifyPartialSignature(message, ps.signature, ps.publicKeyShare)
    );

    if (validPartials.length < this.t) {
      throw new Error('Insufficient valid partial signatures');
    }

    // Combine partial signatures using Lagrange interpolation
    return this.combinePartialSignatures(message, validPartials.slice(0, this.t));
  }

  // Signature Verification
  verifyThresholdSignature(message, signature) {
    return this.curve.verify(message, signature, this.masterPublicKey);
  }

  // Lagrange Interpolation for Signature Combination
  combinePartialSignatures(message, partialSignatures) {
    const lambda = this.computeLagrangeCoefficients(
      partialSignatures.map(ps => ps.signatory)
    );

    let combinedSignature = this.curve.infinity();
    
    for (let i = 0; i < partialSignatures.length; i++) {
      const weighted = this.curve.multiply(
        partialSignatures[i].signature,
        lambda[i]
      );
      combinedSignature = this.curve.add(combinedSignature, weighted);
    }

    return combinedSignature;
  }
}