IMHO, if you light up two or more other identical CRT's and have them display random junk it should throw enough noise to make it worthless - (and would put out enough similar RF to mess with RF tempest) there might be ways to filter the photons from the other monitors out, but, it would be difficult.
----------------------Kaos-Keraunos-Kybernetos--------------------------- + ^ + :"Our enemies are innovative and resourceful, and so are we. /|\ \|/ :They never stop thinking about new ways to harm our country /\|/\ <--*-->:and our people, and neither do we." -G. W. Bush, 2004.08.05 \/|\/ /|\ : \|/ + v + : War is Peace, freedom is slavery, Bush is President. ------------------------------------------------------------------------- On Thu, 2 Dec 2004, Tyler Durden wrote: > Interesting. > Contrary to what I thought (or what has been discussed here), only a > 'scalar' of detected light is needed, not a vector. In other words, merely > measuring overall radiated intensity over time seems to be sufficient to > recover the message. This means that certain types of diffusive materials > will not necessarily mitigate against this kind of eavesdropping. > > However, his discussion would indicate that the various practical concerns > and limitations probably limit this to very niche-type applications...I'd > bet that it's very rare when such a trechnique is both needed as well as > useful, given the time, the subject and the place. > > -TD > > >From: Sunder <[EMAIL PROTECTED]> > >To: [EMAIL PROTECTED] > >Subject: Optical Tempest FAQ > >Date: Thu, 2 Dec 2004 10:27:04 -0500 (est) > > > >http://www.cl.cam.ac.uk/~mgk25/emsec/optical-faq.html > > > >Along with tips and examples. > > > >Enjoy, and don't use a CRT in the dark. :-)
