In case you missed reading the article in HTML format over at EthicalHacker.net, you can take a look at my TEMPEST article at infosecwriters.com
"Ok prepare to strap that tinfoil hat on two notches below excruciating, we’re going to talk about TEMPEST. What is TEMPEST? It’s defined in NSTISSI-7000 as:
Electronic and electromechanical information-processing equipment can produce unintentional intelligence-bearing emanations, commonly known as TEMPEST. If intercepted and analyzed, these emanations may disclose information transmitted, received, handled, or otherwise processed by the equipment. (1) "