You Are How You Surf
Just as some experts can spot a physical imposter by noticing a difference in gait, the IBM invention tracks minute details about the way users interact with the browser and website. Using some areas of the site more than others, navigating with the keyboard, sticking strictly with the mouse, swiping a tablet in a particular way…all of these small characteristics build up an overall profile that identifies you, the legitimate user. A hacker who logs into your account will “look” completely different, so the detection system will send a warning. The secure site can respond by requiring additional authentication. Of course, false detections are possible. Keith Walker, IBM Master Inventor and co-inventor on the patent, noted that a change in interaction could be “due to a broken hand or using a tablet instead of a desktop computer,” but pointed out that “such a change would more likely be due to fraud.” In any case, a legitimate user will have no trouble providing additional authentication.
(via IBM Identifies You By Your Web Surfing Style)