Telepathy should have SRTP support: http://en.wikipedia.org/wiki/Secure_Real-time_Transport_Protocol It's also a prerequisite for supporting ZRTP for key management, which would be a logical progression.
See also https://bugzilla.gnome.org/show_bug.cgi?id=589778.
Duplicate of bug 22952. *** This bug has been marked as a duplicate of bug 22952 ***
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