It would be nice if Telepathy would support the Axolotl protocol (Signal messenger, formerly TextSecure).
There are currently three implementations, for Android, iOS and Google Chrome:
An implementation of the underlying protocol is available via the libaxolotl-c library:
The Java library contains more documentation:
The wire protocol is described here:
And the specs are available here:
Yes, Signal protocol be nice as would OMEMO. The only end-to-end crypto support currently in telepathy is a component of KDE-Telepathy that provides an OTR proxy between incoming messages and the chat widget.
I suspect it might be possible to add additional algorithms there.
Though there's also some additional work needed before the proxy could help Empathy.
Unfortunately I don't believe the few people still contributing to telepathy or its clients have the time to work on this.
The protocol was renamed: https://whispersystems.org/blog/signal-inside-and-out/
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