Password must meet complexity requirements This policy setting checks all new passwords to ensure that they meet basic requirements for strong passwords. When this policy is enabled, passwords must meet the following minimum requirements: - Not contain the user's account name or parts of the user's full name that exceed two consecutive characters - Be at least six characters in length - Contain characters from three of the following four categories: - English uppercase characters (A through Z) - English lowercase characters (a through z) - Base 10 digits (0 through 9) - Non-alphabetic characters (for example, !, $, #, %) - A catch-all category of any Unicode character that does not fall under the previous four categories. This fifth category can be regionally specific. Each additional character in a password increases its complexity exponentially. For instance, a seven-character, all lower-case alphabetic password would have 267 (approximately 8 x 109 or 8 billion) possible combinations. At 1,000,000 attempts per second (a capability of many password-cracking utilities), it would only take 133 minutes to crack. A seven-character alphabetic password with case sensitivity has 527 combinations. A seven-character case-sensitive alphanumeric password without punctuation has 627 combinations. An eight-character password has 268 (or 2 x 1011) possible combinations. Although this might seem to be a large number, at 1,000,000 attempts per second it would take only 59 hours to try all possible passwords. Remember, these times will significantly increase for passwords that use ALT characters and other special keyboard characters such as '!' or '@'. Proper use of the password settings can help make it difficult to mount a brute force attack.

[enable/disable]

(1) GPO: Computer ConfigurationWindows SettingsSecurity SettingsAccount PoliciesPassword Policy!Password must meet complexity requirements (2) WMI: root sopcomputer#RSOP_SecuritySettingBoolean#Setting#KeyName = 'PasswordComplexity' And precedence=1