Messages in this thread | | | Date | Wed, 23 Jul 2003 15:08:57 +0100 | From | John Bradford <> | Subject | Re: 2.4.22-pre7: are security issues solved? |
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> > > > If I know your password is 7 characters I have a smaller > > > > space of passwords to search to just brute-force it. > > > > > > It's much smaller if you didn't know that it was at most 7 characters > > > long. However, if you did know the upper bound, or you were just > > > brute forcing all passwords starting from 1 character, then the > > > difference is relatively minor. This is because > <snip> > > One time passwords are much more secure. > > Nope. > Changing password to a password of similar complexity every 10 seconds > doesn't make it much less likely to be guessed than a static password.
For the attack in question, it does, as long as no two consecutive passwords have the same number of characters.
For example, if the list of OTPs is:
alpha beta epsilon
The user logs in using the first password, and somebody logs that it has five characters. The next valid password, (the only valid one), has four.
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