[mrbiber]

I'd be very excited to see more Free Software instant messaging applications support OMEMO (http://conversations.im/omemo/). It's basically TextSecure's Axolotl protocol with a few slight modifications. As such, it support multi-party OTR-like PFS and multiple devices. In contrast to TextSecure, Conversations (the first client to implement it) allows you to use it without having to install Google Play Services and makes it usable on a decentralized infrastructure (XMPP). If it became standard for Open Source messaging clients (whatever transport they use) to have Omemo built in and use it opportunistically, we might actually have a chance to provide usable crypto to the masses.

[zokier]

Does OMEMO support synchronizing conversations between multiple devices? Being able to jump seamlessly between laptop/phone/desktop is musthave for me, last time I checked that stuff was very much unfinished in XMPP (I think the relevant XEPs were "carbons" and "MAM")

[mrbiber]

In principle, this should work - I haven't tried it, but in Conversations, the fingerprints of my other connected devices show up and I can say that they belong to me.

In any case, there are no desktop clients yet that support OMEMO. Conversations and Jitsi support Message Carbons though (together with a compatible XMPP service, such as yax.im) very well. On the console, there is profanity that also supports it.

[geal]

does it provide ordering and transcript verification, even in case of partition and resume? I know that XMPP is meant to handle that kind of stuff reliably, but a multiparty OTR or Axolotl ratchet should make sure that even if the transport is compromised, you can detect any message drop or tampering.