Publisher review:This module provides a backport of Drupal 6's jQuery password strength checking to Drupal 5. It also adds PHP-based password strength checking and validation routines that mirror the jQuery routines, so that administrators can restrict passwords to only be, for example, "high" strength. The module simply modifies existing password confirm fields (where two passwords are entered, like the user edit form), so no other setup is required beyond configuring the desired enforcement rules.
Features
- Client-side password strength checking using jQuery
- Server-side password strength checking using PHP
- Settings to control: Toggle server-side enforcement of password on/off Enforce low-, medium-, or high-strength passwords
- Fully translatable
Installation
- Unpack in your modules folder (usually /sites/all/modules/) and enable under Administer > Site Building > Modules.
Requirements: ยท Drupal 5.x
Password Strength is a PHP script for Drupal Modules scripts design by Jeff Beeman.
It runs on following operating system: Windows / Linux / Mac OS / BSD / Solaris.
Operating system:Windows / Linux / Mac OS / BSD / Solaris
Password Strength script details 
