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Re: [Model-t] draft-thomson-tmi

Colin Perkins <csp@csperkins.org> Wed, 22 July 2020 13:46 UTC

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From: Colin Perkins <csp@csperkins.org>
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Date: Wed, 22 Jul 2020 14:45:39 +0100
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Cc: Christian Huitema <huitema@huitema.net>, Watson Ladd <watsonbladd@gmail.com>, Eric Rescorla <ekr@rtfm.com>, Mirja Kuehlewind <ietf@kuehlewind.net>, Martin Thomson <mt@lowentropy.net>, model-t@iab.org
To: Carsten Bormann <cabo@tzi.org>
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Subject: Re: [Model-t] draft-thomson-tmi
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> On 22 Jul 2020, at 14:15, Carsten Bormann <cabo@tzi.org> wrote:
> On 2020-07-22, at 03:13, Christian Huitema <huitema@huitema.net> wrote:
>> 
>> Now, voice codec just send at a constant bit rate, independent of the variations in speech. 
> 
> Actually, there is a body of literature about extracting information, such as the language being used or even the content of the speech itself, from encrypted variable-bitrate codecs such as those used in CDMA.
> 
> E.g., https://dl.acm.org/doi/10.1145/1880022.1880029



Also https://tools.ietf.org/html/rfc6562 <https://tools.ietf.org/html/rfc6562> ("Guidelines for the Use of Variable Bit Rate Audio with Secure RTP”) which warns about this issue.


-- 
Colin Perkins
https://csperkins.org/

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