In a recent demonstration, German white hat hackers showed how to intercept text messages sent via the U.S. satellite communication system Iridium and locate users with an accuracy of about 4 kilometers.The twohackers, known publicly only under the nicknames Sec and Schneider, made the revelations during a presentation at the Chaos Communication Congress in late December in Hamburg, Germany. During the talk, they highlighted severe vulnerabilities in services that tens of thousands of users from...