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[ NNSquad ] Uncovering spoken phrases in *encrypted* VoIP conversations

Uncovering spoken phrases in *encrypted* VoIP conversations

http://j.mp/gQcgpr  (Johns Hopkins / UNC)

     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.

Lauren Weinstein (lauren@vortex.com): http://www.vortex.com/lauren
Co-Founder: People For Internet Responsibility: http://www.pfir.org
 - Network Neutrality Squad: http://www.nnsquad.org
 - Global Coalition for Transparent Internet Performance: http://www.gctip.org
 - PRIVACY Forum: http://www.vortex.com
Member: ACM Committee on Computers and Public Policy
Blog: http://lauren.vortex.com
Twitter: https://twitter.com/laurenweinstein 
Google Buzz: http://j.mp/laurenbuzz 
Quora: http://www.quora.com/Lauren-Weinstein
Tel: +1 (818) 225-2800 / Skype: vortex.com