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Advanced Biometric Cryptography & Android Keystore (2025): Build Real Security, Not a Login Screen

Biometrics aren’t a fancy UI step — they’re an operating-system enforced gate to hardware-backed cryptography. This deep dive shows how to design biometric-protected encryption the way banking apps do it: Keystore keys, CryptoObject, AES-GCM, invalidation rules, and hardened fallback flows.