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"HOT OR NOT?" COMES TO COMPUTER SECURITY By   Dan Moren   Posted  March 24, 2015 bittidjz via Flickr / CC BY-SA 2.0 Back in 1999, Neal Stephenson's novel  Cryptonomicon  introduced me to the idea of  Van Eck phreaking —intercepting the weak electromagnetic radiation from a computer monitor to recreate what the person is seeing on the screen. Now security researchers have come up with an exploit that uses an even simpler form of radiation: heat. BitWhisper , as researchers Mordechai Guri and Professor Yuval Elovici of Ben-Gurion University's Cyber Security Research Center have dubbed their program, targets air-gapped machines—computers that are not physically (or wirelessly) connected to the Internet. By using malware that can tap into computers' cooling systems and temperature sensors, the hack can send information back and forth between two adjacent machines. For example, raising the temperature of one computer by a single degree...