Hi Daniel, thanks for the clarification. Is there already something done for OMEMO-next? Where can I contribute?
> Why we use an authentication tag? No, this is clear, but the GCM spec [7] uses only the term additional authenticated data, so I was wondering if this is the same. Cheers On 18.09.2017 16:37, Daniel Gultsch wrote: > I suggest you go dig up the old conversations from the archive on why > we made the 'change' to the siacs namespace. > > TLDR; the 'siacs' XEP describes the current situation and people are > planning on doing some larger changes to OMEMO that might take a very > long time to complete. Thus we wanted to have an addressable (by > version number) state of the XEP that reflects the real world > situation. > > For you there are basically two ways forward > a) To have something that works right now and is compatible with > existing implementations: Implement version 0.2 of the OMEMO protocol > that comes with a hard dependency on the signal protocol > b) Participate in the discussion / protocol development regarding > 'OMEMO-NEXT' that will probably use its own double ratchet among other > improvements. > > 2017-09-18 15:27 GMT+02:00 Klaus Herberth <[email protected]>: >> Is there any explanation for the mentioned authentication tag? > Why we use an authentication tag? Because otherwise there is no direct > link between the authenticated signal whisper message and the cipher > text. w/o it anyone with the key can swap out the cipher text. > > the auth tag is part of the gcm authenticated encryption scheme. > > Future versions might use AES-CBC or something like that. > _______________________________________________ > Standards mailing list > Info: https://mail.jabber.org/mailman/listinfo/standards > Unsubscribe: [email protected] > _______________________________________________
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