I think it is important to note that Tox is still considered alpha. From their own wiki's FAQ: "Tox is by no means complete. You may encounter bugs ranging fro

I think it is important to note that Tox is still considered alpha. From their own wiki's FAQ: "Tox is by no means complete. You may encounter bugs ranging from simple visual defects to segfaults on file shares. We cannot guarantee what works today will work tomorrow; Tox is an alpha program and code changes daily. Certain commits may break existing APIs, and we strive to give proper advanced warning to all client developers, etc. when such changes will be made. Additionally, Tox has not yet received a full security audit. While we believe Tox is secure against attackers who want to decrypt your messages, you may wish to use a more established solution if you are in a life-or-death situation." If you're in a life-or-death situation, I think you really ought to be doing some intensive research into secure communications to find the solution that will work best for you.