Windows 8 picture password
Picture password is provided as a login mechanism in addition to your text password, not as a replacement for it. The software maker assessed a variety of methods to obtain the PIN or picture password sequence on a clean screen with only the gestures visible via smudging. The number of ways for ordering a 4 digit PIN is 24 according to Microsoft, if an attacker is able to see where all four smudges are present on the screen. This is improved to 48 combinations based on line and circle gestures.