This is the README for Secure SMS Andriod Application. THis will enable you to encrypt and send text messages. The user may then unlock via chosen key and view message.
Please refer to the following link for a prototype.
https://www.fluidui.com/editor/live/preview/p_GgV2DFgffUx394bG9MuU0cPC66LHHPJu.1414797231468