SPIFFE is a standard framework for securely identifying workloads and providing verifiable identities. In service-to-service communication, it helps establish trust between microservices without relying only on manually managed credentials. section 3.1.2 section 3.3
A practical use case is mutual TLS (mTLS): services exchange X.509 certificates, establish a secure TLS connection, and identify callers from certificate fields. Service meshes and SPIFFE simplify deploying and managing this stronger form of TLS. section 3.1.2
SPIFFE belongs alongside service meshes, API gateways, credential storage, Kubernetes, X.509 certificates, and OAuth 2.0 as part of a cloud-native security toolkit. section 3.3

