pe, 2007-09-07 kello 13:35 -0700, Shawn Rutledge kirjoitti: > It's easy to think first of doing it over a data connection. But I > can imagine more of a signal-processing approach.
This has been hashed to death. Short of it: the GSM codec actively tries to throw away anything that doesn't sound like speech. This is not very analog encryption friendly, and we can't bypass the codec for voice calls since that's in the closed TI firmware. This is also a repeat, but for new people, I'll mention that cryptophone.de does a proprietary encryption-capable GSM phone (through GSM data); though the protocol is their own, they apparently have it documented, and welcome others to do compatible implementations. (Their source is also available, but for purely review and verification purposes; it's not free and anyone doing a reimplementation would be wise to avoid looking at it.) Thus for anyone interested in doing encrypted calls with the Neo, it would perhaps be worth considering using their ready-made protocol to leverage their installed base. I haven't reviewed their protocol though, nor am I highly qualified to do that. Also, there's the usual potential future issues with the protocol being controlled by a single firm; basically that's just something to consider for those who eventually get hacking on this. Sadly, it's too big a project for me. -- Mikko Rauhala - [EMAIL PROTECTED] - <URL:http://www.iki.fi/mjr/> Transhumanist - WTA member - <URL:http://www.transhumanism.org/> Singularitarian - SIAI supporter - <URL:http://www.singinst.org/> _______________________________________________ OpenMoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community