Beware of the tell-tale smudge

University of Pennsylvania researchers say they can take a picture of the screen of a touch screen phone, enhance the contrast on the smudge marks, and detect the password 92% of the time. Their advice: clean your phone. Which is kind of good advice anyway.

About the author

John Moe is the host of Marketplace Tech Report, where he provides an insightful overview of the latest tech news.

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