Full Disclosure mailing list archives
Re: How to encrypt voice skype calls?
From: "Fabio Pietrosanti (naif)" <lists () infosecurity ch>
Date: Fri, 20 Jun 2008 17:35:46 +0200
Arturo 'Buanzo' Busleiman wrote:
I'm pretty sure an alsa (sorry, no windows here) audio encryption/decryption plugin could be written, and have that mic/speak interface be used by skype.
Be careful! Scrambling != encryption !!!!! Scrambling it's applied to an analog signal to convert some frequencies. SIGSALY it's Secure Digital Voice Communications in World War II: - http://en.wikipedia.org/wiki/SIGSALY - http://www.flickr.com/photos/44165698@N00/2534235949/ If you scramble your voice, staying within the frequencies allowed by the narrowband compression codec used by skype you cannot have a full digital path on which encipher a data stream with a good encryption algorithm (that process bucks of data and not frequencies). There are no secure scrambling technology. The only way to secure a voice path is to have a digital path enciphered on which you put the compressed voice sample. But working on the "analog" processing the voice before it's compressed it's NOT an option. For such reason i was wondering how this could be accomplished on a Skype based call. Maybe by enciphered audio samples directly in the memory of skype: - Hooking into skype to encipher audio samples before they are packed in a frame? - Hooking into skype to encipher audio samples after they are packed in a frame? Or maybe by leveraging the skype transport for the "digital path" and using our own encoding/decoding framework: - Changing some bunch of data (from offset X to offset Y) in the ip packets "on the net"? (There's some checksum?) Are all funky ideas, but i mean, i don't trust skype :) _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- How to encrypt voice skype calls? Fabio Pietrosanti (naif) (Jun 20)
- Re: How to encrypt voice skype calls? Steward Smith (Jun 20)
- Re: How to encrypt voice skype calls? Peter Dawson (Jun 20)
- Re: How to encrypt voice skype calls? Arturo 'Buanzo' Busleiman (Jun 20)
- Re: How to encrypt voice skype calls? Ureleet (Jun 20)
- Re: How to encrypt voice skype calls? Arturo 'Buanzo' Busleiman (Jun 20)
- Re: How to encrypt voice skype calls? Fabio Pietrosanti (naif) (Jun 20)
- Re: How to encrypt voice skype calls? Arturo 'Buanzo' Busleiman (Jun 20)
- Re: How to encrypt voice skype calls? Ureleet (Jun 20)