SPIFFE (Secure Production Identity Framework for Everyone)

A Uniform Resource Identifier (URI) that uniquely and unambiguously identifies a specific workload. The format is spiffe://trust-domain/workload-identifier.

• Example: spiffe://prod.example.com/ns/frontend/sa/web-server
• Encodes trust domain, namespace, and service account into a single string
• Eliminates ambiguity from IP addresses or hostnames in dynamic environments
• Serves as the subject in X.509 certificates and JWT tokens

A cryptographically signed document that a workload presents to prove its identity. SVIDs are the portable identity credential in SPIFFE.

• X.509 SVIDs: Short-lived certificates for mTLS authentication
• JWT SVIDs: Compact tokens for application-layer authorization
• Automatically rotated before expiration by the SPIFFE Agent
• Binding proof of possession prevents token replay attacks

A local gRPC endpoint exposed by the SPIFFE Agent on every node. Workloads call this API to retrieve their identity documents without managing private keys.

• Listens on a Unix domain socket for local-only access
• Issues SVIDs only to processes that pass kernel-level attestation
• Eliminates the need to inject secrets into containers or CI/CD pipelines
• Supports automatic re-attestation when workloads restart or reschedule

A trust domain is the administrative boundary for identity issuance, corresponding to a single SPIFFE authority. Federation enables cross-domain trust.

• Trust Domain: Logical grouping of workloads sharing a common root of trust (e.g., prod.example.com)
• Federation: Bidirectional trust established via bundle exchange between domains
• Enables secure communication between agents in different organizations or clouds
• Prevents certificate authority compromise from cascading across domains

The process by which a SPIFFE Agent proves the identity and integrity of the node it runs on before being granted the authority to issue SVIDs.

• Hardware-based: Leverages TPM, vTPM, or AWS Instance Identity Documents
• Cloud-provider: Validates platform-specific metadata (GCE, Azure, AWS)
• Join token: Bootstrap method using a one-time token for initial registration
• Prevents rogue agents from joining the trust domain and issuing fraudulent identities

The production-grade reference implementation of the SPIFFE specifications. SPIRE is a CNCF graduated project that operationalizes workload identity.

• SPIRE Server: Central authority for identity registration and SVID issuance
• SPIRE Agent: Per-node daemon that performs attestation and exposes the Workload API
• Pluggable architecture for custom attestors and key managers
• Integrates natively with Kubernetes, Envoy, and Istio for service mesh identity

A bidirectional authentication protocol where both client and server present and validate X.509 certificates during the TLS handshake. Unlike standard TLS where only the server proves its identity, mTLS ensures each party cryptographically verifies the other.

• Eliminates bearer tokens by binding identity to ephemeral key pairs
• Forms the transport layer for SPIFFE-based workload authentication
• Prevents unauthorized agents from injecting commands into service meshes
• Certificate rotation happens in seconds, not months, reducing exposure windows

A security paradigm that assigns a verifiable, machine-readable identity to a specific software process, container, or pod rather than relying on network location, IP addresses, or static credentials stored in config files.

• Identity is cryptographically attested, not asserted through secrets
• Enables fine-grained access policies: "Only the payment-processor service can read this database"
• Survives infrastructure churn—containers restart, IPs change, identity persists
• Fundamental to SPIFFE's design philosophy of identity-first security

A security model that eliminates implicit trust and requires continuous verification of every access request, regardless of whether the request originates from inside or outside the traditional network perimeter.

• Core principle: "Never trust, always verify"
• Every agent-to-agent call must be authenticated and authorized in real time
• SPIFFE provides the identity substrate that makes ZTA practical at scale
• Replaces VPN-based perimeter security with identity-aware proxies and sidecars

The production-grade reference implementation of the SPIFFE standards. SPIRE is a toolchain that issues, distributes, and rotates SVIDs (SPIFFE Verifiable Identity Documents) to workloads across heterogeneous environments.

• SPIRE Server: Central authority that registers workloads and signs identity documents
• SPIRE Agent: Daemon running on each node that performs local workload attestation
• Supports node attestation (proving a machine's identity) and workload attestation (proving a process's identity)
• Integrates with Kubernetes, Envoy, and major cloud providers natively

The cryptographic identity document that a workload presents to prove its identity in a SPIFFE-compliant system. An SVID binds a SPIFFE ID to a public key and is signed by a trusted authority.

• X.509-SVID: A standard X.509 certificate with a SPIFFE ID in the Subject Alternative Name (SAN) field, used for mTLS
• JWT-SVID: A JSON Web Token containing the SPIFFE ID, used for application-layer authentication
• Short-lived by design—typically valid for minutes or hours, not years
• Automatic rotation eliminates the operational nightmare of certificate expiry outages

A dedicated physical computing device that safeguards and manages digital keys for strong authentication and provides cryptoprocessing. HSMs prevent private key exfiltration by ensuring keys are generated, stored, and used entirely within the tamper-resistant hardware boundary.

• SPIFFE deployments can use HSMs to protect root signing keys for SVID issuance
• Prevents the catastrophic scenario where a compromised SPIRE server leaks its signing key
• Enables FIPS 140-2 Level 3 compliance for regulated industries
• Common in financial services and government agentic system deployments