Eat a lot of greasy hand food? Then consider avoiding one of the ways Google offers to unlock an Android device.
Google's mobile operating system lets people unlock devices by swiping a particular pattern across a three-by-three grid of dots. But Android evangelist Tim Bray raised a concern about "reverse smudge engineering" to figure out the unlock pattern.
Bray recommends people stop swiping altogether and concludes that the numeric code option is the best for him: "The PIN has the huge advantage that it uses a nice big fat numeric keypad, and I can type it in really, really fast; I could do it right in front of you five times in a row and you'd have no clue, I bet.""A couple of colleagues had my original Galaxy Tab and needed to use it for something, but I wasn't there. They managed to figure out my pattern by looking at the fingerprints on the glass, and it only took them a few minutes," Bray said in a post yesterday."
SOURCE: ongoing by Tim Bray · Safe Unlocking