[guardian-dev] The sound of an encrypted audio stream

[Josh Steiner]

Whoa, that is way too recognizably human for comfort.  i could totally see
with some training being able to understand that.

-j


On Tue, Jul 23, 2013 at 1:47 PM, Lee Azzarello <lee at guardianproject.info>wrote:

> Hello all,
>
> There have been some conversations recently on IRC and on the web
> about VBR audio codecs and plaintext recovery.
>
> It's an interesting conversation and one which will change a lot in
> our times. While I was testing some video call clients, I saw a bug
> between a custom build of Linphone on Android and a nightly of Jitsi
> on OS X where Linphone tried to play back the encrypted audio through
> the speaker without first decrypting it.
>
> This is what a SRTP audio stream sounds like to a wiretap. The codec
> is speex at 16 kHZ, I believe it is VBR but I'm not certain.
>
> http://ge.tt/9FG7Tem/v/0?c
>
> -lee
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