KryptEY

KryptEY - Secure E2EE communication

An Android keyboard for secure end-to-end-encrypted messages through the signal protocol in any messenger. Communicate securely and independent, regardless of the legal situation or whether messengers use E2EE. No server needed.

KryptEY was created by mellitopia and amnesica.

Motivation

Breaking of end-to-end encryption (E2EE) by laws such as the planned EU chat control is an ongoing issue. Content in messengers that use E2EE, such as Whatsapp or Signal, could thus be monitored by third parties. E2EE is often, but not always, standard in messengers. There are proven methods for E2EE such as PGP. However, these methods are sometimes cumbersomely integrated and require a lot of effort to use.

KryptEY is an Android keyboard that implements the Signal protocol. The keyboard works messenger-independently and both the X3DH Key Agreement Protocol and the Double Ratchet Algorithm work without a server, thus it enables a highly independent use of the protocol.

Features Based upon the Simple Keyboard KryptEY adds a view above the Keyboard for the E2EE functionality.

• use E2EE through Signal Protocol in any messenger
• encryption/decryption of messages
• enter message through separate text field in keyboard
• use clipboard to read messages
• manage contacts in own contact list in keyboard
• message log to view sent/received messages
• send messages as plain JSON (raw mode) or hidden in a decoy text (fairytale mode)
• verification of E2EE functionality via fingerprint
• Q&A view helps with questions
• dark & light theme