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SSH client/server chatting software

I'm looking for communication software that uses SSH encryption, and is client/server based. The only program I have seen so far is ytalk. I must emphasize security as being the first priority of any server/client communication program I am looking for. Please reply with any others you know of.

You can tunnel any TCP connection though SSH so you could tunnel another chat protocol over ssh. Does it have to use SSH, or is SSL/TLS OK?

Jabber server with ssl support there are dozens of jabber clients such as GAIM
http://www.jivesoftware.org/wildfire/

Quote:

Wildfire supports SSL/TLS encrypted connections out of the box as well as packet auditing to meet compliance requirements. Optionally tie Wildfire into your organization's existing authentication system such as LDAP and then handle thousands of concurrent users on a single server.

Open Source and Open Protocol

Wildfire is available under the Open Source GPL or a commercial license. It supports the open XMPP (Jabber) IM protocol and popular extensions. XMPP is supported by dozens of IM clients and allows for easy federation between IM servers. Wildfire is among the most compliant XMPP servers available.

might want to look at the SILC protocol as well