This is a vague question: it depends entirely on the protocol you're about to use. I'll try to give a few answers anyway. First of all, if you want total encry

This is a vague question: it depends entirely on the protocol you're about to use. I'll try to give a few answers anyway. First of all, if you want total encryption, you'll need to make sure your connection is encrypted and secured as well (meaning following you back is not trivial), so the whole messaging should go through Tor[1]. There are plugin solutions for bitlbee[2], for Pidgin[3], and many other clients supporting OTR and similar encryptions. If you want all-in-one solutions, you probably should look at Tox[4], which is a protocol, not just an app, built to be encrypted by default. It's complicated and nasty to use and set up, but it's pretty secure. Other ideas might be drawn from the prism-break Communications list[5], listing apps like Chatsecure[6] or Xabber[7], both encryption-capable jabber apps. [1]: https://www.torproject.org/ https://www.torproject.org/ [2]: https://wiki.bitlbee.org/bitlbee-otr https://wiki.bitlbee.org/bitlbee-otr [3]: https://developer.pidgin.im/wiki/ThirdPartyPlugins#SecurityandPrivacy https://developer.pidgin.im/wiki/ThirdPartyPlugins#Securitya... [4]: https://tox.chat/ https://tox.chat/ [5]: https://prism-break.org/en/protocols/ https://prism-break.org/en/protocols/ [6]: https://chatsecure.org/ https://chatsecure.org/ [7]: https://www.xabber.com/ https://www.xabber.com/