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In response to security issues raised regarding Face Unlock, Samsung incorporated blinking for added security," the company said on its official blog in March.
Samsung’s modified system, however, adds in the requirement that the user must blink while they’re being observed by Face Unlock, thus going some way to prove that they are a real person rather than a still photograph.
Blinking: http://www.monstertechblog.com/2012/03/29/blink-if-youre-human-samsung-boosts-android-face-unlock-security/