# Patterns
All Patterns notes →01 — Authentication Patterns
OAuth, OpenID Connect, API Keys, and Mutual TLS — proving identity between a client and a service, and between services themselves.
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02 — Authorization Patterns
RBAC, ABAC, ReBAC, and Capability-Based Security — the models for deciding what an authenticated identity is allowed to do.
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03 — Secure Communication Patterns
Zero Trust, Service Mesh, and Secrets Management — how a system stops trusting the network itself and starts verifying every call.
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