Cracking windows passwords in 5 seconds

[Dave Farber <dave () farber net>]

> Date: Tue, 22 Jul 2003 16:54:33 -0700
> From: Richard Perlman <perl () lucent com>
> Subject: FW: (RPG) Fw: Cracking windows passwords in 5 seconds
> To: Dave Farber <dave () farber net>
>
>
> Might be of interest to the IPers.
>
> Richard
>
> ----- Original Message -----
> From: <bugtraq () oechslin net>
> To: <bugtraq () securityfocus com>
> Sent: Tuesday, July 22, 2003 1:37 PM
> Subject: Cracking windows passwords in 5 seconds
>
>
> As opposed to unix, windows password hashes can be calculated in advance
> because no salt or other random information si involved. This makes so
> called time-memory trade-off attacks possible. This vulnerability is not
> new but we think that we have the first tool to exploit this.
>
> At LASEC (lasecwww.epfl.ch) we have developed an advanced time-memory
> trade-off method. It is based on original work which was done in 1980 but
> has never been applied to windows passwords. It works by calculating all
> possible hashes in advance and storing some of them in an organized
> table. The more information you keep in the table, the faster the
> cracking will be.
>
> We have implemented an online demo of this method which cracks
> alphanumerical passwords in 5 seconds average (see
> http://lasecpc13.epfl.ch/ntcrack). With the help of 0.95GB of data we can
> find the password after an average of 4 million hash operation. A brute
> force cracker would need to calculate an average of 50% of all hashes,
> which amounts to about 40 billion hases for alphanumerical passwords
> (lanman hash).
>
> More info about the method can be found at in a paper at
> http://lasecwww.epfl.ch/php_code/publications/search.php?ref=Oech03.
>
>   Philippe Oechslin
>
> ------ End of Forwarded Message

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