Internet privacy: How network analysis can reveal details you would rather hide.
In July, LinkedIn co-founder Reid Hoffman wore a strange device on his wrist as he gave a talk to the MIT Media Lab . The QSensor , developed by the lab's Affective Computing Group , blinked to display Hoffman's overall stress level as he spoke. Behind him, the live Twitter feed for #MediaLabTalk scrolled by on two giant screens. One tweet noted, "You can see Reid Hoffman's stress monitor blink faster as he struggles to recall details of an article he just read." Hoffman's stress level also elevated each time his high-tech accessory was mentioned, as when Media Lab Director Joi Ito joked that the Media Lab planned to enhance all future talks by hooking presenters up to lie detectors. Though the device is not actually a lie detector (and even full polygraph tests are not great at spotting lies ), the device may have helped a viewer distinguish the points on which Hoffman was confident from those he was less sure about. All this dovetailed nicely with one of the themes of his talk: With increased public scrutiny, information becomes more trustworthy.Volunteering one's own physiological data to demonstrate openness is not so far-fetched in a time when technological changes are causing social barriers to crumble. The day when we all sport stress monitors is probably not looming. But we may already be unintentionally volunteering that information. Recent research by Ming-Zher Poh, Daniel J. McDuff, and Rosalind Picard of that same Affective Computing Group has found that pulse information can be gleaned from a basic webcam . It turns out that blood changes the skin's color slightly with each pulse, in a way that can be recovered from a video signal using a technique called independent component analysis. Though the technology has not yet proven itself outside the lab, where controlled lighting conditions can make such analysis easier, it is not hard to imagine that pulse could be recoverable from video recordings of normal teleconferences. Pulse therefore joins the long list of information that we are leaking all the time over the Internet without really knowing it.
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