SecureIM
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SecureIM is an encryption system built into the Trillian Instant Messenger Client.
It encrypts messages from user-to-user, so no node between the two is supposedly able to read the encrypted messages.
According to Cerulean Studios, the makers of Trillian, SecureIM enciphers messages with 128-bit Blowfish encryption. It only works with the OSCAR protocol and if both chat partners use Trillian.