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You can also put a cap on the number of characters of any particular class. With minclass set to 4, passwords would have to include all four types of characters-like “howzit2B?”-and, if we get credit for uppercase, digits or other characters, we'd be OK even with the minlen set to 12. If set to 2, minclass would require you to use characters from two classes, like uppercase and lowercase, or lowercase and digits. #Passwords plus windows cannot set catagories passwordIf minclass is set to 2, a password containing all lowercase, all uppercase, all digits, or all any other class of characters wouldn't work. One other setting that comes into play is the minclass setting, which determines how many different classes of characters must be used for a password to be acceptable. Maybe you don't get any credit for lowercase characters. Maybe you will get credit for only one digit or two uppercase characters. Note, however, that you can only get credit for so many of the different characters. However, we can also grant credits for uppercase, lowercase, and non-alphanumeric characters like punctuation marks. If dcredit were set to 1, you would need an additional character. #Passwords plus windows cannot set catagories plusSo, eight characters plus credits is valued as highly as 10 characters without credits. Why? Because you'd get two credits for the digits. If dcredit is set to 2, on the other hand, the password "hijlmq99" would also pass. Basically, a shorter password might be acceptable if it's more complex with respect to the mix of characters.Īs an example, a password like "hijlmqrazp" might pass a minlen=10 test. The idea of "credits" (e.g., lcredit and ucredit) is very interesting. That is, even if you set minlen equal to 4 and give credit for many types of characters, passwords with fewer than six characters will be rejected. Note that, regardless of the value you set for minlen, passwords cannot have fewer than six characters. ![]() Password requisite pam_pwquality.so retry=3 minlen=12 difok=1 remember=3 lcredit=1 ucredit=1 ocredit=1 dcredit=-1 The same settings on a Debian system might look like this: The credit settings mean your users will get credits for using a mix of character types that can reduce the password length requirement. These settings on a Red Hat system might look like this.
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