Jul 6, 2012
Using ChatSecure on an iPhone or iPad, you can have an end-to-end encryption chat session with someone using the Guardian Project’s Gibberbot on Android (or Pidgin, Jisti, or Adium on the desktop as well) through any Jabber/XMPP compliant chat service such as GTalk, Jabber.org, or even Facebook (gasp!). You can also run your own server using something like OpenFire or Prosody.
https://guardianproject.info/2012/06/08/a-partnership-for-open-secure-mobile-messaging-between-ios-and-android/