cryptophone ideas

[Perry E. Metzger]

Peter Wayner says:
> How hard is it to reprogram the DSP that comes with a cellular
> phone right now? I've never opened one up. Can you just unsolder
> a rom, read it, insert your own code for DH key exchange, add
> some encryption, burn a new ROM and have a secure phone? 

You would also have to open up the base station for the cell, unsolder
its roms, read them, insert your own code for DH key exchange, add
some encryption, and put it back, and I suspect that the cellular
vendor would get mad at you.

Perry