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"If you believe common wisdom, it shouldn't be possible to take over most webcams without alerting users.  The indicator LED is supposed to be hack-proof, after all.  However, a pair of Johns Hopkins researchers have recently published a research paper showing that it's possible to control the camera while keeping the indicator dark.  Their proof-of-concept app, iSeeYou, reprograms a controller chip on pre-2009 Macs to separate the camera and LED functions; users can flick the light on and off like a switch.  Apple is aware of the issue with its own systems, but it hasn't said whether or not there will be a fix.  It's also unclear how many newer Macs or other PCs are at risk.  Regardless of the exact threat, the study isn't very reassuring in an era of widespread surveillance -- if a pair of academics can stealthily record your activity, it's likely that professional spies can do the same."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2013/12/18/study-proves-that-you-can-secretly-hijack-an-older-mac-webcam/?ncid=rss_truncated>