In an attempt to call attention to the need for greater security, a German computer scientist has published the secret code that encrypts most cell phone calls.
New York Times: Think your cell phone call is private? Think again. On Monday, German computer scientist Karsten Nohl deciphered and published the GSM algorithm, the secret code that encrypts most mobile phone traffic. In a speech in Berlin, Nohl said, "This shows that existing G.S.M. security is inadequate. We are trying to push operators to adopt better security measures for mobile phone calls."