On Fri, 11 Aug 1995, David Neal wrote:
On Fri, 11 Aug 1995, Vladimir Z. Nuri wrote:
when someone invents cheap hardware that you can just plug on top of any existing phone, i.e. "the phone adaptor", TPA?, *that's* when the world is going to go crazy with crypto.
It's closer than you think. I've been messing with TI's Digital Signal Processing DSK. For $99 you get a DSP with audio in, audio out and 10k of memory. Reference implementations of : DTMF encoders/decoders; 300, 1200, 2400 baud modem programs; and voice processing software already exist.
It would be interesting to create a hardware device which is interoperable with PGPFone but uses a DSP chip and a slower control processor. I can easilly imagine $100-$150 as a reasonable range. I will be really curious to see what kind of voice coder they are using in PGPFone...I assume it is some flavor of CELP. -Thomas