AgePony
Kotlin implementation of the age encryption protocol for Android
...Private keys can be protected through Android Keystore hardware, biometric authentication, or compatible YubiKey devices. The application supports SSH-based digital signatures, signature verification, and trusted signer management. Additional tools include encrypted key vaults, QR-based key sharing, secure device-to-device transfers, and multi-file archives. AgePony operates locally without accounts, external servers, or analytics, keeping encryption operations under user control.