Password Rules is a small extension I’ve developed for WordPress. You can download it via the WordPress plugin directory.
This simple plugin allows the WordPress site administrator to enforce minimal password requirements on its user. You can specify a minimal password length. You can also demand that users input uppercase characters, digits or special characters. This only effects password changes. Existing passwords will not be validated.
Right now the extension is available in French and English. If you translated it in an other language, please send me the PO file and the MO file and I’ll include it in the next release along with a thank you note.
If, heaven forbids, you were to find a bug in this extension … or if you have a suggestion on how to make it more useful … send me an email at firstname.lastname@example.org.