Improve the security of unlocking your smartphone

There is a paper at WOOT 10' described how to use smudges on the touch sceen of a smartphone to get largely decrease the time an attacker need to guess the right password to unlock the screen. For example, by for 4 passcode based iPhone, one just need to try at most P(4,4) = 4! = 24 times before he get the right one.

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