You may have protected your personal data with strong passwords, but when hackers seize control of other computers, the resulting "botnets" can cause plenty of collateral damage. The depressing part is that one of the biggest holes is the easiest to fix: terrible passwords. SplashData has just released its annual list of the worst ones (gleaned from hacked file dumps), and things haven't changed much over last year. The most common stolen password is still "123456," which edged out perennial groaner "password." Other top picks in the alphanumeric hall of shame are "12345678," "qwerty," "monkey" and new this year, "batman." According to security expert Mark Burnett, the top 25 (below) represent an eye-popping 2.2 percent of all passwords exposed.