On Wed, Jun 20, 2007 at 06:14:07PM +0200, Karel Kulhavy wrote: > > And guess what. Keyboards use a serial protocol. Which means that > > there will be slightly different voltage drops in the system varying > > The capacitors and regulator which are made to keep the voltage almost > constant > with a swing of tens of amperes (60W/1.5V=40A) will not permit a measurable > swing when you change the current draw by a milliamp or so. The precision of > voltage measurement is too low for this and the noise from other permanently > running sources too high.
This kind of security design is assuming favourable constellation of uncontrollable environmental noises to scramble the information we are knowingly leaking. It's basically a snake oil. We have no proof that under every conceivable circumstances the noises will be present in a way that completely masks the information leak. -- Darrin Chandler | Phoenix BSD User Group | MetaBUG [EMAIL PROTECTED] | http://phxbug.org/ | http://metabug.org/ http://www.stilyagin.com/ | Daemons in the Desert | Global BUG Federation
