0

I need help calculating the number of possible passwords with a given set of criteria. Here is the set of criteria:

  • Passwords are case insensitive.
  • Must be 6-14 characters.
  • Must contain at least 1 letter and 1 number.
  • Must not be equivalent to your current or 3 previous passwords.
  • May not contain 9 or more numbers.
  • May not be identical to your Username.
  • May not repeat the same number or letter more than 3 times in a row.
  • May not contain more than 3 sequential numbers or letters (such as '1234' or 'abcd') in a row.
  • May contain special characters (such as @, %, &, #).

Any help would be greatly appreciated.

N. F. Taussig
  • 76,571
dprofancik
  • 1
  • 2
    Any thoughts of your own? –  Apr 21 '16 at 17:06
  • Well, most of those criteria are limiting the number of possible passwords. I would start by taking how many possible 6-letter password, 7-letter password, ... , 14-letter password combos there are, and then whittling down the result using the criteria. – kanker7 Apr 21 '16 at 17:07
  • Thanks, yeah I understand that that's what I have to do. I'm just not sure how to calculate some of the criteria, such as..."May not repeat the same number or letter more than 3 times in a row." or "May not contain more than 3 sequential numbers or letters (such as '1234' or 'abcd') in a row." – dprofancik Apr 21 '16 at 17:27

0 Answers0