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An authenticated encryption mode that encrypts data with AES and also produces a tag that detects any change to it.
AES-GCM (NIST SP 800-38D) both hides the data and proves it has not been altered: decryption fails if even one bit of the ciphertext, nonce or key is wrong. It needs a unique nonce for every encryption with the same key. HostSpica uses AES-256-GCM for stored secrets (with keys in Android Keystore) and for backup files (with a key from your password). A wrong password or a damaged backup therefore fails cleanly instead of returning garbage.
Our expert team can help you leverage AES-GCM in your project.
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