Implementing Zero-Trust Security in Event-Driven Microservices

# Implementing Zero-Trust Security in Microservices Perimeter security is obsolete. In modern cloud-native systems, every microservice must treat incoming requests as untrusted. ## Key Pillars of Zero-Trust 1. **Mutual TLS (mTLS)**: Encrypt all inter-service communication with automatic certificate rotation via Istio or Linkerd. 2. **Cryptographic Identity**: Issue short-lived SVID certificates using SPIFFE/SPIRE to authenticate workloads dynamically. 3. **Continuous API Authorization**: Validate scopes and user permissions at every microservice hop using Open Policy Agent (OPA).