Define password complexity police

To make sure that all passwords match a required complexity (length, special characters etc.), go to the configuration of your password customfield and click on Edit Fixed Encryption Key:

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Here you have the option to define minimal and maximal length and required characters/numbers/upper case etc.:

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After saving, it is not possible to enter a password into the password field, which does not match your defined password requirements. Also, there will be a short message, which criteria has to be fulfilled so that the user is able to correct the password according to the complexity policy.