[Freeswitch-dev] Speex + SRTP.. Think again!

Steve Underwood steveu at coppice.org
Thu Jun 12 13:44:35 EDT 2008

Brian West wrote:
> http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/sp/2008/3168/00/3168toc.xml&DOI=10.1109/SP.2008.21
> This is very interesting.  That rules out ALL VBR codecs when using  
> SRTP for security reasons.
It probably rules out DTX/CNG setups too. The rhythm of changes between 
audio and DTX could well let someone pick up something about what is 
being said. Its gonna give less info that VBR changes, but every clue 
helps the evesdropper.


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