I found a nice and helpfull extension to Make BE user password really secure in TYPO3.
„What does it do?
This extension gives you the possibility to force secure passwords from your BE users. You can setup the password patterns like e.g. capitals, digits, etc. and a minimal length of the password. After activating the extensions, your BE users must fit the patterns and the length of the password to save a new one!
This extension works with TYPO3 4.2.7 and higher versions including TYPO3 4.3.0.
With TYPO3 4.5 and higher you can set a reminder to let the users remind of changing their password.“
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