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One system I use just changed their password policy. Previously, the only requirement was 6 digits. (e.g. 123456, 111111)

Now it's 8 digit, with no bigger then 3 digit sequence, and no pattern such as abab anywhere.

No clear rules but the following are invalid:

  • 11111111
  • 12345678
  • 12393659 (because of ^123)
  • 76768747 (because of ^7676)
  • 11195712 (because of ^111)

Any way to calculate the difference in randomness? mainly, is the set now bigger or smaller?

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    I think this might be more suitable for crypto.SE.2011-12-19
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    good point, changed the question on the last line to be more math oriented.2011-12-19

3 Answers 3