A micrograph of HeLa cells, derived from cervical cancer cells taken from Henrietta Lacks. Tomasz Szul/Visuals Unlimited, Inc./Getty Images hide caption

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Cell phone communication can be hacked, tapped or otherwise tampered with. A new app aims to change that. iStockphoto hide caption

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Fill out an application for a loan, and your wage history may go places you didn't expect. Joe Raedle/Getty Images hide caption

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Each strand of DNA is written in a simple language composed of four letters: A, T, C and G. Your code is unique and could be used to find you. iStockphoto.com hide caption

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Shwetak Patel (foreground), a MacArthur Fellow, recognized that every device in a home has a unique signature that can be used to track energy usage. The data collected by Patel's system showed that digital video recorders were responsible for 11 percent of this home's power use, just one example of The Human Face of Big Data. © Peter Menzel 2012/from The Human Face of Big Data hide caption

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Who's collecting information about her? Peggy Turbett /The Plain Dealer /Landov hide caption

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In this photo illustration, the Google logo is seen through a pair of glasses in Glasgow, Scotland. The European Union says a change in Google's privacy policy is a breach of European privacy law. Jeff J. Mitchell/Getty Images hide caption

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Many Web users have little idea about how, or when, they're being tracked. In this 2011 photo, Max Schrems of Austria sits with 1,222 pages about his activities on Facebook — the company gave him the file after he requested it under European law. Ronald Zak/AP hide caption

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Employers have been asking for prospective employees' Facebook username and passwords to do some extra research on whom they may be hiring. Leon Neal/AFP/Getty Images hide caption

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Wouldn't you love to know what she's jotting down? Of course you would. iStockphoto.com hide caption

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