Actually, if somebody wants to start developing PC based voice encryption, there's a pretty significant installed base of machines that can handle it already. By the end of 1992, there were about 3 million machines with sound cards, by the end of 93 it's projected to reach 6 million. Anyone that has a Soundblaster or Soundblaster compatible has both a DAC output and a microphone input. On a machine with a 9600 or 14,400 kilobaud modem, sufficient real-time compression of voice to fit within the modem bandwidth is a quite reasonable objective. I know of at least three people in the computer game industry that have been working on it, and at least one of them already has functional code. I'm sure there's a pretty fair number of Macintoshes out there that have all the hardware to support real-time encrypted voice communications also, though I don't follow the numbers in the Mac market these days... Dr. Cat / no .sig, why bore people?