Unmasked: An Analysis of 10 Million Passwords

A lot is known about passwords. Most are short, simple, and pretty easy to crack. But much less is known about the psychological reasons a person chooses a specific password. We’ve analyzed the password choices of 10 million people, from CEOs to scientists, to find out what they reveal about the things we consider easy to remember and hard to guess.

From Unmasked: An Analysis of 10 Million Passwords