The worst password of 2013 was 123456, according to SplashData's analysis. The firm said the successive numbers were runner up for two years in a row behind "password." SplashData noted that it found more numerical passwords in 2013 than in previous years.
Much like the password "qwerty," about 10 percent of users rely on a successive string of numbers, according to the Avast research. The firm said that 44 percent of users have accounts susceptible to brute force attacks because they are using a successive string of numbers, names and common combinations, and birthdates. Phone numbers are not a good idea either, Avast said.