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RE: ADS Password Storage Protection
From: Harold Winshel <winshel () camden rutgers edu>
Date: Tue, 18 Jul 2006 08:40:44 -0400

Dennis,

Yes, I do realize that, but I wonder about two potential problems. One, it consists of real words and two, it's a phrase that probably exists verbatim - punctuation and all - in numerous sources that I figure would be easily digitized. So my question is couldn't something like Bartlett's Book of Quotations, or any other number of compilations of common phrases and sayings, be included as part of a passphrase cracking program?

That is, if a dictionary can be thrown at a password, why couldn't a book of phrases also be thrown at a password?

Harold


At 08:35 AM 7/18/2006, Depp, Dennis M. wrote:
The phrase you gave, "frankly, my dear, I don't give a damn" meets most
definitions of complexity.  I has upper and lower case letters and
special characters.

Dennis

-----Original Message-----
From: winshel () camden rutgers edu [mailto:winshel () camden rutgers edu]
Sent: Saturday, July 15, 2006 12:25 AM
To: security-basics () securityfocus com
Subject: Re: RE: ADS Password Storage Protection

I've read and heard many sources say this same thing, i.e., that, for
windows systems, length is stronger than short and complex.  And that a
15 character or longer password can be a real phrase and it will be a
secure password.


I can see why a long password that consists of a real phrase - such as
"frankly, my dear, I don't give a damn" - would be just as secure as an
equally long complex password, in terms of protection against a brute
force attack.


I don't know much about password cracking programs but am surprised
that, while they would be working  on a brute force attack, they
wouldn't be able to try a lot of commonly-used phrases at the same time.


If some password cracking programs can use a dictionary attack, couldn't
there also be something called a passphrase attack?  Would it be
difficult for a password cracker to digitize Bartlett's Book of
Quotations and include that in an attack on a password?

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---

Harold Winshel
Computing and Instructional Technologies
Faculty of Arts & Sciences
Rutgers University, Camden Campus
311 N. 5th Street, Room B36 Armitage Hall
Camden NJ 08102
(856) 225-6669 (O)


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This list is sponsored by: SensePost

Hacking, like any art, will take years of dedicated study and practice to master. We can't teach you to hack. But we can teach you what we've learned so far. Our courses are honest, real, technical and practical. SensePost willl be at Black Hat Vegas in July. To see what we're about, visit us at:
http://www.sensepost.com/training.html
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