[Freeswitch-users] Uncovering spoken phrases in *encrypted* VoIP conversations

Kristian Kielhofner kris at kriskinc.com
Tue Mar 15 22:36:46 MSK 2011

More scaremonger tactics from paper authors and journalists...

This is for variable bitrate codecs only.  Weaknesses in encryption
for non-padded VBR codecs have been known for some time.

On Tue, Mar 15, 2011 at 2:59 PM, EdPimentl <edpimentl at gmail.com> wrote:
> New recent study at (Johns Hopkins / UNC) says it can Uncover spoken phrases
> in *encrypted* VoIP conversations
> (Johns Hopkins / UNC) ACM paper
>     We evaluate our techniques on a standard speech recognition corpus
>     containing over 2,000 phonetically rich phrases spoken by 630
>     distinct speakers from across the continental United States. Our
>     results indicate that we can identify phrases within encrypted calls
>     with an average accuracy of 50%, and with accuracy greater than 90%
>     for some phrases. Clearly, such an attack calls into question the
>     efficacy of current VoIP encryption standards.
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Kristian Kielhofner

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