tc is a low-tech free software to chat anonymously and
ciphered over Tor circuits in PGP. Use it to protected your
communication end-to-end with RSA/DSA encryption and keep yourself
anonymously reachable by anyone who only knows your .onion address
and your public key. All this and more in 2400 lines of C code that
compile and run on BSD and Linux systems with an IRC like
GUI.
Read more https://packetstormsecurity.com/files/174560/tc.tgz