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Re: [tor-talk] Using Mumble with Tor

Nathan Freitas:
> 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. :)

Nathan, thank you again for those OTR insights.

Do you know if it will be possible in future to cryptographically sign
files using OTR?

I'll find OTR implementations much simpler to use, since key exchange
happens transparently to the user and automagically.

Maybe OTR can be someday used to do everything OpenPGP can do?
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