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As your day ticks by, it seems that everything you do can leave a data trail. From your purchases online to the resumes you post, to health care transactions made with your insurance cards, you probably are exposing your own personal data to possible snooping, fraud, or identify theft. "Having so much sensitive information available makes it even more difficult for other organizations to release information that is effectively anonymous," says Latanya Sweeney, associate professor of computer science, technology and policy, and director of Carnegie Mellon's Data Privacy Lab. Sweeney demonstrated that birth date, gender and 5-digit ZIP code is enough to identify 87 percent of people in the U.S. One year ago, Sweeney started to pull together a group of faculty who were looking at issues relating to privacy and security, and working toward possible solutions. In the Internet age, few areas of our private lives-and what U.S. Supreme Court Justice Louis Brandeis called "the right to be left alone"- remain untouched by technology. Lorrie Cranor, associate research professor in the School of Computer Science, and director of Carnegie Mellon's Usable Privacy and Security Laboratory, describes Carnegie Mellon as "the place to be for privacy research." She explains, "There's a concentration of researchers and experts here that you just don't find at any other university." So how do these Carnegie Mellon experts suggest you protect yourself when you find the information technology that drives your everyday life to be more sophisticated than you are? Here is a sample of some of their creative solutions-your wake-up call for keeping your data "self" both private and secure.