On 03 Mar 2003 22:21:43 -0500 "James H. Cloos Jr." <[EMAIL PROTECTED]> wrote: > Essentially a steg technique, yes?
"With normal fonts, the electron guns in your monitor abruptly switch on and off when they encounter the edge of a character, emitting a pulse of telltale tempest radiation. But by smoothing the edges of the characters using a mathematical algorithm, the guns switch more gently, thus avoiding compromising signals." (Stealth Fonts, Tom Standage, Wired magazine Jun 1998) http://www.wired.com/wired/archive/6.06/crucialtech.html?pg=8 Anti-aliasing, also the psychological principle that we can recognize a letter of the alphabet from a partial or distorted representation (given the context - i.e. if you know what your looking for). Some more background information: The original research - 'Soft Tempest: Hidden Data Transmission Using Electromagnetic Emanations', Markus Kuhn http://secinf.net/authentication_and_encryption/Soft_Tempest_Hidden_Data_Transmission_Using_Electromagnetic_Emanations.html http://www.cl.cam.ac.uk/~mgk25/ih98-tempest.pdf http://www.cl.cam.ac.uk/~mgk25/st-fonts.zip - Markus Kuhn http://www.cl.cam.ac.uk/~mgk25/ The Complete, Unofficial TEMPEST Information Page http://www.eskimo.com/~joelm/tempest.html - "DEMCOM provides Soft-TEMPEST fonts in their Steganos II security suite", ref. here but links to a broken link http://www.eskimo.com/~joelm/tempestsource.html#TEMPEST\ Hardware\ &\ Consulting - "a freeware Windows text editor (called Zero Emission Pad) that incorporates anti-TEMPEST font technology", referenced here http://www.eskimo.com/~joelm/tempestintro.html#General\ TEMPEST\ Information but that is nowhere to be seen! http://www.steganos.com/ __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com _______________________________________________ Fonts mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/fonts
