Encrypt Your Text Messages with New Android App
Whisper Systems have released public betas of two new Android apps.
RedPhone 0.1 provides end-to-end encryption for your calls, using your existing mobile number for addressing.
TextSecure is a drop-in replacement for the standard text messaging applications. When communicating with someone else who is running TextSecure, messages are encrypted during transmission, and texts sent or received with TextSecure are stored in an in-phone encrypted database.