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Re: [Linphone-developers] do audio and video are encrypted in ZRTP mode

From: Werner Dittmann
Subject: Re: [Linphone-developers] do audio and video are encrypted in ZRTP mode ?
Date: Wed, 09 Sep 2015 09:09:58 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

Am 08.09.2015 um 21:20 schrieb Johan Pascal:
> Hi,
> yes linphone support video stream encryption using ZRTP key exchange.
> There is no really need to announce ZRTP support in the INVITE as ZRTP 
> support is basically announced by sending/waiting for ZRTP Hello packet.

Pascal is right. A proper implementation must be able to use ZRTP without
any support from SIP. The client _may_ use the ZRTP specific SIP fields to
perform some checks (see the RFC for details). If another ZRTP supporting
client _requires_ the SIP fields then this implementation is not according 
to the RFC.


> It shall work on all platform, including mac.
> johan
> On 08/09/15 18:56, Eeri Kask wrote:
>> On Tue, 08 Sep 2015 09:38:29 +0200, Werner Dittmann wrote:
>>> If Linphone implemented it correctly (which I don't know) then
>>> also the video stream(s) are encrypted, at least ZRTP provides the
>>> features to do this :-) .
>> 'm usually using zrtp-encoded audio+video sessions from android-linphone
>> to android-linphone (in long-distance calls video sometimes gets stuck
>> on call setup though), and from pjsua-desktop-client which has the
>> abovementioned ZRTP implementation to android-linphone; but not managed
>> to establish a zrtp-session from anything to WP8-based linphone!
>> (Linphone didn't (or does not) announce anything zrtp-related during
>> session INVITE, so the other endpoint has to know about upcoming zrtp
>> content by other means.)
>> (Some time ago linphone-on-macosx while advertising supporting zrtp,
>> didn't support video-zrtp (or I simply didn't manage to get it to work),
>> and even didn't inform the user about not encoding video!  Haven't
>> tested again since then.)
>>      Eeri Kask
>>> Am 07.09.2015 um 19:23 schrieb ???? ?????:
>>>> Hello everyone,
>>>> I want to know that if you activate ZRTP encryption, do the video AND the 
>>>> audio are encrypted in video conference or only the audio ?
>>>> I tested for the audio, and it's indeed encrypted, but don't have the tool 
>>>> to check for the video!
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Werner Dittmann
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