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Common Passwords and Common Words in Passwords
A strong password must be a long sequence of characters. Ideally, each character in a strong password should be randomly selected from a large character set. In practice, people prefer to create passwords that are easy to remember. In this work, we analyzed over 600 million leaked passwords from different websites. We find most passwords are weak due to the fact either the passwords are used by different accounts (users) or these passwords use a small set of words. This dictionary size can be as small as 90,000. We also found about 95% of leaked passwords of yahoo.com include some substring(s) that match about six millions passwords from the rockyou.com leak.