How this works:
Your password will be checked against

• length (must be at least 6 chars long)
• combinations of your username (forward and reverse)
• combinations of lowercase, uppercase, and digits
• a dictionary file of common words

Suggestions:

• Use a password using the first letter of each word.
  Example: "May the force be with you". Use: Mtfbwy
  Or even change it up: MtfBwU!
• Use a random password generator
• Use a stong password, but still make it easy to remember. If it is too strong, you might end up writing it down or forgetting.
• These are just suggestions. Your password is still up for approval from the actual "passwd" change.
• Remember, a strong password is hard to guess.