CSpace – Free Most Secure IM Messenger
CSpace, an open source secure instant messenger that provides secure messaging conversation over the internet. This secure instant messaging messenger is based on user to user communication technology (P2P) to provide secure, decentralized, user-to-user communication channel over the internet.
Cspace messaging communication method is similar to Socket API connect (IP,Port) method, which the program is utilizing a custom network port for text messaging purpose. Once you communicate with other parties with Cspace, all you need is know what special network port that you want to use on CSpace.
Meanwhile, the messaging security technology of CSpace is pretty awesome, which it works on 2048-bit RSA keys for encrypt all text Chat, File Transfer services and remote desktop connection. Besides that, CSpace secure IM messenger will take care of locating the user and creating a secure, network address translation/firewall friendly connection.
I believe CSpace is the best free secure IM that you ever used for.
Read more details about the specication and how it works on CSpace Website