On Wednesday, July 16, 2003, at 10:15 AM, Sunder wrote:

And TEMPEST monitoring equipment (or again, a hidden pinhole camera behind you, or a transmitter hidden in your monitor) won't see what's on your screen because????

From a purely optical perspective, pinhole cameras have terrible spatial resolution. I doubt a pinhole camera behind a user, probably on a wall 10 feet behind the user, could resolve 12-point type. Resolving a large "virtual keyboard" on a screen would be a lot easier, of course. We've talked many times about using laptops, heads-up displays (like the Sony glasses), and even putting mesh bags over a user and his laptop. Actual Faraday cage rooms are not really needed. All security is economics, so I would think a lot of bang for the buck happens with solving the most pressing problems people have with security: leaving their machines unattended, not using any crypto at all, writing passphrases down on Post-It notes, not checking for audio bugs, etc. --Tim May "We are at war with Oceania. We have always been at war with Oceania." "We are at war with Eurasia. We have always been at war with Eurasia." "We are at war with Iraq. We have always been at war with Iraq. "We are at war with France. We have always been at war with France."