Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.
To meet password policy requirements, passwords need to be changed at specific policy based intervals.
If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed as per policy requirements.
Weak passwords are a primary target for attack to gain unauthorized access to databases and other systems. Where username/password is used for identification and authentication to the database, requiring the use of strong passwords can help prevent simple and more sophisticated methods for guessing at passwords.
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