The experience of signing in to your PC with touch has traditionally been a cumbersome one. In a world with increasingly strict password requirements—with numbers, symbols, and capitalization—it can take upwards of 30 seconds to enter a long, complex password on a touch keyboard. We have a strong belief that your experience with Windows 8 should be both fast and fluid, and that starts when you sign in. Other touch experiences in the marketplace have tried to tackle this problem, with the canonical example being a numeric PIN. A PIN is a great solution: Almost everyone has seen or used one before, and a keypad is simple to use with touch. We knew though, that there was room to improve. A numeric combination often presents a problem for people because the sequences easiest to remember are typically the least secure. Common number sequences—like 1111, or 1234—are troublesome, but PINs that are composed of common well-known personal dates can also be deduced if an attacker has personal...
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