Silence works like any other SMS application. There's nothing to sign up for and no new service your friends need to join.
Silence communicates using encrypted SMS messages. No servers or internet connection required.
Silence provides end-to-end encryption for your messages using the painstakingly engineered Axolotl encryption protocol.
All messages are encrypted locally, so if your phone is lost or stolen, your messages are protected.
Silence is Free and Open Source, enabling anyone to verify its security by auditing the code.