Microsoft Password check is a free online tool to help you determine if your password is really strong or not ?
A strong password should appear to be a random string of characters to an attacker.
Each character that you add to your password increases the protection that it provides many times over. Your passwords should be 8 or more characters in length; 14 characters or longer is ideal.
It should include a combination of uppercase and lowercase letters, numbers, and symbols. Link.
Find this article at: http://www.labnol.org/internet/tools/calculate-the-strength-of-your-passwords-online/2503/
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