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Modern Authentication & Authorization Architecture 12-Layer Panoramic Cheat Sheet

A comprehensive reference guide to modern authentication (AuthN) and authorization (AuthZ) across a 12-layer architecture: from password hashing (Argon2id/bcrypt), server sessions, JWT lifecycle, OAuth 2.0+PKCE, and FIDO2 Passkeys, to RBAC/ABAC/ReBAC models, OPA/Cedar policy engines, enterprise SSO/SCIM, workload mTLS/SPIFFE, and autonomous AI Agent delegation.

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