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Re: AW: ADS Password Storage Protection
From: Joe Barr <joe () pjprimer com>
Date: Fri, 21 Jul 2006 11:49:14 -0500

On Thu, 2006-07-20 at 08:25 +0200,
Christian.Assfalg () bc boehringer-ingelheim com wrote:
What you say is true, length increases the maximum number of possible
passwords far more than a greater number of base characters. That is
statistical mathematics. However, it assumes that the characters are
not dependant on the other characters, which is not always the case.
That's why dictionary attacks work so fine. You can substitute a
number of characters (say 4) with all possible 4-character-long words.
That reduces your complexity quite a bit. A passphrase of 8 words with
5 characters each does not translate to 24^40 possibilities, but
rather to (whatever-the-number-of-5-character-words-in-english-is)^8.
In a dictionary attack, you can use this to significantly reduce the
number of tries you have to try.

I'm not following this.  A dictionary attack will be of no use against a
passphrase of 8 words, will it?


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