Re: [tor-talk] Using Mumble with Tor

[Nathan Freitas <nathan@xxxxxxxxxxx>]

On 07/14/2013 10:40 PM, adrelanos wrote:
> There is no such thing such as OTR for voice, video or files.

If you are on the otr-dev list, you might have seen some discussion on
improvised support for a data channel in OTR v3, to use with the ability
to generate an "extra" symmetric key:

"OTR version 3 defines an additional symmetric key that can be derived
by the communicating parties to use for application-specific purposes,
such as file transfer, voice encryption, etc. When one party wishes to
use the extra symmetric key, he or she creates a type 8 TLV attached to
a Data Message (see above). The key itself is then derived using the
same "secbytes" used to compute the encryption and MAC keys used to
protect the Data Message. The extra symmetric key is derived by
calculating h2(0xFF) and keeping the entire 256 bits, using the same
definition of h2 as above."

http://www.cypherpunks.ca/otr/Protocol-v3-4.0.0.html

We are actively developing this as part of our OTR implementation in
Gibberbot for Android, v12, and have most of it working
(https://github.com/guardianproject/Gibberbot/pulls).

Our plan is to use this to implement media sharing, and even a
push-to-talk feature, that is all securely tunneled through OTR.

So, in short, there will soon be such a thing as OTR for voice, video
and files. :)

+n
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