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A strong password is a random password. By "random". "Entropy" is the name of the mathematical concept by which this randomness can be expressed. Take care that "password entropy" is a property of the process which generated the password, and cannot be measured on the password itself
Good passwords / passphrases:
- A strong password must be at least 8 characters long.
- It should not contain any of your personal information—specifically your real name, user name, or even your company name.
- It must be very unique from your previously used passwords.
- It should not contain any word spelled completely.
- It should contain characters from the four primary categories, including: uppercase letters, lowercase letters, numbers, and characters.
- should be 8 characters or longer, which forces you to use multiple words or extra symbols.
- should have upper case, lower case, symbols, and numbers; or at least three of those four groups.
- should not be a common word and should not be a common phrase.
- should not contain a date, a name, or other things that can be associated with you.
- should be created randomly or semi-randomly.
- should not be a suggestion when you type in the first few characters into Google.