Your cellphone allows authorities to locate you and uncover your sources. By Danny O'Brien

Your cellphone allows authorities to locate you and uncover your sources. By Danny O'Brien

Few cases better underscore the need for digital security among journalists. On Tuesday, ex-CIA officer John Kiriakou pleaded guilty to leaking the identity of another CIA operative to Matthew Cole, a journalist formerly with an ABC News investigative team. In a 2007 interview with ABC, Kiriakou became the first CIA official to confirm that waterboarding had been used on Al-Qaeda suspects.