3 ms·
Makes you wonder what else can be used. How about power draw? If you can load and unload the CPU at will, it could send detectable waves all the way out of the
by Artlav 10y ago
Makes you wonder what else can be used.
How about power draw? If you can load and unload the CPU at will, it could send detectable waves all the way out of the facility.
Many designers going after EMI shielding and standard compliance completely miss the concept of conducted emissions - the rf-range noise that goes out of the wires connected to the device, i.e. power, rather than RF.
Then, think of the laptop charge adaptors - most of them whine when plugged, and the pitch of the whine changes with the state of charge of the laptop. The computer might be secured, but a power supply on the other side of the air gap is easy to forget about.
- na85 10y agoThis is why TEMPEST certification is a thing.
- monocasa 10y agohttps://en.wikipedia.org/wiki/Power_analysis https://en.wikipedia.org/wiki/Power_analysis
- e12e 10y agoI seem to recall some work from late 90s early 00s about researchers measuring signals in a regular wall outlet - but right now all I could find was: http://www.pcworld.com/article/161166/article.html http://www.pcworld.com/article/161166/article.html (from 2009, which seems way too recent for what I'm thinking of).