TextSecure app not in repo
"A secure text messaging application for Android.
TextSecure is a replacement for the standard text messaging application, allowing you to send and receive text messages as normal. Additionally, TextSecure provides:
- Local Encryption -- All text messages, regardless of destination, that are sent or received with TextSecure are stored in an encrypted database on your phone.
- Wire Encryption -- When communicating with a recipient who is also using TextSecure, text messages are encrypted during transmission."
https://github.com/WhisperSystems/TextSecure
http://en.wikipedia.org/wiki/TextSecure
https://guardianproject.info/apps (ctrl+F "3rd party applications we support, develop on, and recommend" section)