CipherKeys

Android keyboard with PGP encryption.

After installing, enable in Settings > System > Keyboard > On-screen keyboard > CipherKeys.

Features

Full QWERTY keyboard with dark/light theme support
PGP encryption and decryption directly from the keyboard
Key generation (Ed25519/Curve25519 and RSA-4096)
Recipient management with import/export
Passphrase caching (cleared on device lock)
Inline compose panel with blinking cursor, tap-to-position, and auto-scroll
Encrypt-and-send via long-press on enter key
Long-press number keys on top row
Haptic and sound feedback on key press (configurable)
Key press popover showing pressed character above the key
Shift lock and symbol lock (double-tap or long-press, configurable)
Auto-capitalize after sentence-ending punctuation
Configurable key height, key background shading
Cleartext PGP sign with optional message expiration
Encrypt-to-self option (auto-add your key to all encryptions)
Inline recipient picker when encrypting without recipients selected
Send and long-press Enter encrypt-and-send to app input
Signature verification on paste with valid/invalid/expired banners
Passphrase input auto-resets keyboard to lowercase
Backspace repeat on long-press
Physical keyboard support: panel accepts external keyboard input, Ctrl+Enter submits
Numeric keypad layer via long-press ?123, auto-selected for numeric fields
Email fields swap comma for @ key
Encrypted configuration backup & restore (keys, recipients, settings)
Recipient picker with recent-first ordering and always-ask option
Skips re-encrypting already-encrypted messages
Interactive help system

Add https://github.com/mlekudev/cipherkeys-releases in Obtanium. Zero configuration - autodetects via GitHub releases.

export ANDROID_HOME=~/Android/Sdk
./gradlew assembleDebug
# APK at app/build/outputs/apk/debug/app-debug.apk

Apache 2.0