Validating user password quality using hash reverse lookup?

As many said before, the hash of the password is the last one of the security issue.

Is more a question of good manner, as many user uses the same password on different sites, is a good manner that YOU, owner of a site, will not know the password of the user, as it can be the password of some other web service.

Attack like brute force are done by forcing lot of password on your form, so if a user choose as password 123, your program will take this 123, encrypt with the most fantastic and modern system and grand the access to the attacker, as the attacker has to guess the decripted password, not the encripted one.

If you have a vulnerability that expose your database, attacher will be more interested to read credit card number than hashed password.

So, don’t worry for hash!!