The offspring of this years GSOC XSF projects is OMEMO. An axolotl and PEP based open standard for end-to-end encryption. Would be great to see support for it in Xabber.

XEP: XEP-0384: OMEMO
Related Smack issue: SMACK-743
ProtoXEP: http://conversations.im/xeps/multi-end.html
More info: http://conversations.im/omemo/