Cipher Chat Private Messenger for Android
There is no account or password, but a randomly generated 2048-bits RSA key-pair and user id which will allow you to securely exchange messages and pictures with your friends.
No other peer and not even the server will understand your messages so please keep in mind that we do not take responsibility for the people with whom you are chatting.
In some countries, an encryption program such as this may attract attention, be illegal or subject to legal constraints.