Hi!
The signed preKeys are used for authentication.
The deviceId is a 31 bit integer because of libsignals implementation I guess.
Deviceid collisions with own devices are not allowed (the newer device has to
generate a new Id in that case). In mucs it doesn't really matter, since the
receiving device can simply try to decrypt with every matching keyId In the
message.
Also the signal protocol works just the same with mucs as it does with single
user chats. You simply forward all the ratchets of all recipients.
Kind regards
Vanitasvitae
Am 13. März 2017 09:32:29 MEZ schrieb "Remko Tronçon" <re...@el-tramo.be>:
>Hi,
>
>I have a few questions/remarks about XEP-0384:
>
>- The examples mention signed pre-keys. This isn't part of the Olm
>protocol
>AFAICT, I only saw it in the original double ratchet spec. Is this a
>remnant of an older version of the XEP? Should this be dropped, or is
>the
>plan to use X3DH eventually?
>
>- The XEP uses AES128-GCM for encryption, which seems different from
>Olm
>(which uses AES256-CBC). I know very little about crypto, but is there
>a
>reason for going with AES128 instead of AES256? I'm asking, because on
>first sight, it seemed easier to find support for AES256-GCM (e.g. in
>libsodium/nacl) than for AES128-GCM.
>
>- I can't find a reference in the XEP on how the ratchet algorithm
>works in
>multi-user settings (there's only a reference to Olm, which AFAICT only
>works for single users). Is this where megaolm steps in? Should there
>be a
>reference to a protocol?
>
>- The Device ID being a randomly generated 32-bit integer seems out of
>the
>ordinary? Not that the chances of collisions in a big MUC are *that*
>big,
>but would a GUID be more consistent with some previous XEPs? Should
>something be said about what to do when recipient device IDs collide?
>
>- Cosmetic: camel case is used for tags/attributes, whereas I believe
>kebab-case is more consistent with other XEPs?
>
>thanks!
>Remko
--
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