Agent Identity & Authentication Framework

Threats mitigated

• T3 Privilege Compromise

  Breaking information system boundaries through context collapse, causing unauthorized data access/leakage, or exploiting tool privileges to gain unauthorized access to systems.

• T9 Identity Spoofing & Impersonation / Agent Identity Compromise

  Impersonating trusted agents, users or services, or taking over an agent's own persistent identity and credentials, to act under a trusted identity.

• T12 Agent Communication Poisoning

  Injection of malicious data into inter-agent communication channels or using external systems for side channel communications and memory persistence.

• T13 Rogue Agents in Multi-Agent Systems

  Compromised AI agent activity outside monitoring limits or orchestration in multi-agent systems.

• T16 Insecure Inter-Agent Protocol Abuse

  Attackers abuse the trust and control semantics of agent interoperability protocols such as MCP and A2A: manipulating server responses, injecting context, publishing misleading tool descriptions or exploiting ambiguous consent flows.

OWASP AISVS coverage

The AISVS 1.01 chapters and verification requirements this control helps satisfy.

C5 Access Control & Identity for AI Components & Users

• C5.1.2 Level 3

  Verify that AI agents in federated or multi-system deployments authenticate using short-lived, minimal-scoped, cryptographically signed tokens.

C9 Orchestration & Agentic Security

• C9.4.1 Level 2

  Verify that each agent instance has a unique cryptographic identity and authenticates as a first-class principal to downstream systems.

• C9.4.2 Level 2

  Verify that agent-initiated actions are cryptographically bound to each step of the execution chain for non-repudiation.

• C9.4.3 Level 3

  Verify that agent identity credentials rotate on a defined schedule.

C10 Model Context Protocol (MCP) Security

• C10.2.1 Level 1

  Verify that MCP servers validate access tokens for each request and do not rely on transport security alone.

• C10.2.2 Level 1

  Verify that MCP servers validate the presented access token's issuer, audience, expiration, and scope claims in accordance with OAuth 2.1.

• C10.2.7 Level 1

  Verify that MCP servers only accept tokens explicitly issued for them, and do not pass tokens issued for other services through to downstream APIs.

Design phase

Architecture, threat modelling and policy decisions made before code is written. 16 tasks.

Agent Identity Architecture

• Design decentralized identifier (DID) framework for self-sovereign agent identities
• Plan verifiable credential (VC) system for agent capability and authorization attestation
• Design agent reputation and trust scoring mechanisms
• Plan agent identity lifecycle management (creation, verification, revocation)
• Design cross-domain trust establishment and federation protocols
• Plan agent identity recovery and backup mechanisms
• Design identity privacy protection and selective disclosure
• Plan agent identity compliance with regulatory requirements

Authentication Framework Design

• Design multi-factor authentication for agent systems
• Plan cryptographic identity verification with digital signatures
• Design hardware-based identity anchoring with TPM and secure enclaves
• Plan biometric-equivalent authentication for agent uniqueness
• Design authentication protocol selection and negotiation
• Plan authentication performance optimization and caching
• Design authentication audit trails and monitoring
• Plan authentication incident response and recovery procedures

Build phase

Implementation, testing and hardening while the agent is developed. 32 tasks.

DID Implementation

• Build decentralized identifier infrastructure:
  • W3C DID standard compliance with method-specific implementations
  • DID document creation, resolution, and verification
  • Public key infrastructure integration with DID methods
  • DID registry management with distributed ledger integration
  • Cross-chain DID interoperability and resolution
• Implement verifiable credential systems:
  • W3C VC data model implementation with JSON-LD and JWT formats
  • Credential issuance workflows with trusted issuer networks
  • Credential verification and validation procedures
  • Zero-knowledge proof integration for privacy-preserving credentials
  • Credential revocation and status management

Strong Authentication Implementation

• Deploy cryptographic authentication mechanisms:
  • ECDSA and EdDSA digital signature schemes
  • Multi-signature schemes for enhanced security
  • Hardware security module (HSM) integration for key protection
  • Threshold cryptography for distributed key management
• Build authentication protocol implementations:
  • Challenge-response authentication with replay protection
  • Mutual authentication with bidirectional verification
  • Token-based authentication with JWT and custom formats
  • Certificate-based authentication with X.509 and custom formats

Agent Registry & Discovery

• Build secure agent registry systems:
  • Distributed agent registry with consensus mechanisms
  • Agent metadata management with capability descriptions
  • Agent search and discovery with privacy protection
  • Agent reputation tracking and scoring algorithms
• Implement agent verification systems:
  • Agent identity proofing and validation procedures
  • Capability verification with testing and attestation
  • Trust relationship establishment and management
  • Agent certification and compliance validation

Operations phase

Monitoring, response and continuous improvement once the agent is live. 20 tasks.

Identity Lifecycle Management

• Monitor agent identity creation, updates, and revocation processes
• Execute regular identity verification and re-authentication procedures
• Maintain agent identity registry health and availability
• Deploy identity compromise detection and response procedures
• Execute identity compliance audits and regulatory reporting
• Maintain identity backup and disaster recovery procedures
• Deploy identity performance monitoring and optimization

Trust & Reputation Operations

• Monitor agent reputation scores and trust relationships
• Execute trust calibration and bias detection procedures
• Maintain trust relationship audit trails and transparency reporting
• Deploy trust incident response and relationship recovery procedures
• Execute trust model validation and improvement initiatives
• Maintain trust metrics and stakeholder reporting
• Deploy trust education and awareness programs

Authentication Operations

• Monitor authentication success rates and security incidents
• Execute authentication system updates and security patching
• Maintain authentication performance and availability monitoring
• Deploy authentication incident response and forensic procedures
• Execute authentication compliance and audit support
• Maintain authentication documentation and training materials

Tools and frameworks

DID & Verifiable Credentials

• DID Methods: did:web, did:key, did:ethr, Microsoft ION, Hyperledger Indy
• VC Libraries: SpruceID DIDKit, Microsoft VerifiableCredentials-SDK, Evernym Vcx
• Blockchain Integration: Ethereum, Hyperledger Fabric, Sovrin Network
• Identity Wallets: Trinsic, Evernym Connect.Me, Microsoft Authenticator

Cryptography & PKI

• Crypto Libraries: libsodium, OpenSSL, Bouncy Castle, MIRACL
• HSM Integration: PKCS#11, SafeNet Luna, Thales nShield, AWS CloudHSM
• Certificate Authorities: Let's Encrypt, DigiCert, internal CA with step-ca
• Key Management: HashiCorp Vault, AWS KMS, Azure Key Vault

Authentication Protocols

• Standards: OAuth 2.0, OpenID Connect, SAML 2.0, WebAuthn
• Libraries: Passport.js, Spring Security, Keycloak, Auth0 SDKs
• Multi-Factor: TOTP, HOTP, FIDO2, YubiKey, SMS/Email verification
• Enterprise: Active Directory, LDAP, Kerberos, RADIUS

Registry & Discovery

• Service Discovery: Consul, etcd, Zookeeper, Kubernetes DNS
• Distributed Registries: IPFS, Ethereum, Hyperledger, custom blockchain
• Search & Indexing: Elasticsearch, Solr, Algolia, custom search engines
• Monitoring: Prometheus, Grafana, custom identity metrics dashboards

Related controls

• M3 Secure Inter-Agent Communication shares T9, T12, T13, T3, T16
• M10 Defense-in-Depth Architecture & Trust Boundaries shares T3, T9, T12, T13, T16
• M13 Secure Development Lifecycle Integration shares T3, T9, T12, T13
• M6 Comprehensive Security Monitoring & Auditing shares T13, T3, T16

References

• W3C DID Core
• W3C Verifiable Credentials
• SPIFFE/SPIRE