Think Twice : Before You Ship AI-Generated Code to Production

A real story about Android Keystore, 4 million users, and why “looks correct” isn’t the same as “is safe.”

A few days ago, I found myself staring at a production crash that looked innocent enough:

java.security.InvalidKeyException: Keystore operation failed

SECURE_HW_COMMUNICATION_FAILED

Nothing unusual. Android Keystore. Hardware-backed encryption. One of those bugs that every Android engineer eventually meets.

Like many engineers in 2026, I did what most of us do nowadays — I asked AI.

Actually, I asked two AIs.

• Both were incredibly confident.
• Both sounded convincing.
• Both were wrong.

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The Crash

The crash happened while initializing a Cipher using an AES key stored inside Android Keystore.