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SPIRE (SPIFFE Runtime Environment) is an open-source workload-identity implementation that issues and verifies cryptographic identities for workloads using the SPIFFE standard. It provides components and APIs that infrastructure products can use to establish workload identity, including node and workload attestation and credential issuance.
A workload-identity implementation and building block used under the hood by other infrastructure products. The speakers distinguish it from higher-level products that provide workload identity without requiring users to manage SPIRE directly.