❗Let's close the gap: We still need your help to raise $40,000 by April 1. Donate now
Codebreaker

Beware of the tell-tale smudge

John Moe Aug 11, 2010

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.

There’s a lot happening in the world.  Through it all, Marketplace is here for you. 

You rely on Marketplace to break down the world’s events and tell you how it affects you in a fact-based, approachable way. We rely on your financial support to keep making that possible. 

Your donation today powers the independent journalism that you rely on. For just $5/month, you can help sustain Marketplace so we can keep reporting on the things that matter to you.