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Does this really work?
Authored by: robophilosopher on Sep 15, '07 08:49:36PM

Has anybody tested this with an actual keylogger? It seems to me (disclaimer: I don't know much about the digital espionage business per se, but bear with me) that just because a keylogger needs no interaction with the computer, this technique won't work to detect an adequately designed device. Theoretically (and I wouldn't be surprised if practically) a keylogger can be a pass-through conductor, with the "device" bit independent of the main USB line. I would suspect that if the device doesn't have a USB ID or interact with the computer in any way, the computer won't see it. (For example, would this file change if you added a USB extension cord and left all else the same?)

If you were really dedicated, you might find a way to determine the small power consumption difference, but this is probably practically impossible to detect given the fluctuations going on in that system anyway.

Just the humble opinion of a physics undergrad student :-)

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