<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Found it yesterday. <a href="https://www.cl.cam.ac.uk/~rja14/Papers/nato-tempest.pdf" class="">https://www.cl.cam.ac.uk/~rja14/Papers/nato-tempest.pdf</a><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>paul<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Apr 23, 2020, at 10:46 PM, Thomas DeBellis <<a href="mailto:tommytimesharing@gmail.com" class="">tommytimesharing@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Fascinating. You wouldn't happen to remember that font, would you by any chance? Or the paper?<br class=""><br class="">My current revenue generating incarnation is as an ISO, so I'm sure I'd appreciate it.<br class=""><br class="">On 4/23/20 8:06 PM, Paul Koning wrote:<br class=""><blockquote type="cite" class=""><br class=""><blockquote type="cite" class="">On Apr 23, 2020, at 8:01 PM, William Pechter <<a href="mailto:pechter@gmail.com" class="">pechter@gmail.com</a>> wrote:<br class=""><br class="">Actually the fun mil-spec VT100 was the Tempest VT100. Metal case to avoid radiating information into the air and a metal cased VT100 keyboard.<br class=""><br class="">Dropped that in my lap only ONCE at the FBI facility I was Field Service for. Ugh.<br class=""><br class="">bill<br class=""></blockquote>One of the strangest crypto / security papers I ever read was from famous cryptologists in England, who designed a font that dramatically cuts emissions from a video monitor. You could pretty much get TEMPEST compliance simply by downloading that font and using it for your text instead of the stock font. The magic, as I recall, was soft edges, so the square waveforms typical of a text video signal were smoothed.<br class=""><br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>paul<br class=""><br class=""><br class=""></blockquote></div></div></blockquote></div><br class=""></div></body></html>