RE: ADS Password Storage Protection

["Depp, Dennis M." <deppdm () ornl gov>]

I may be wrong, but I thought rainbow tables only worked with NTLM
passwords.  If you force the passwords to be NTLMv2, rainbow tables are
not useful in cracking the passwords. 

Dennis

-----Original Message-----
From: Eoin Miller [mailto:eoin.miller () trojanedbinaries com] 
Sent: Monday, July 17, 2006 6:20 PM
To: eric.baechle () dhs gov
Cc: security-basics () securityfocus com
Subject: Re: ADS Password Storage Protection

eric.baechle () dhs gov wrote:
> Winshel;
>
> Actually, a passphrase is not as secure as a random password.  As you
probably have heard, "Don't use dictionary words" over and over again.
Even compound dictionary words are bad, ie: "firedogdalmation".
Compounding dictionary words with spaces, punctuation, and even
gramatically correct modifiers in between is really no different than
without.  It's a very simple substitution to try; "firedogdalmation" and
then try "fire dog dalmation", "Fire Dog Dalmation", "Dalmation the Fire
Dog", etc.
> Using compound dictionary words could come back to bite you very
quickly, even when used in long phrases.
> Sincerely,
>
> Eric Baechle, CISSP/ISSEP, etc.
> Senior INFOSEC/OPSEC Engineer
> Department of Homeland Security
>
>   
Password length is still extremely important. A completely randomized 8
character length password is still no match for an attacker with the
rainbow tables at their disposal. Complexity requirements should still
be employed, but having a length requirement of less than 12 characters
is not adaquate. I believe the idea expressed by Winshel of length being
more important than randomness is a result of these types of precomputed
hash attacks.

--Eoin

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