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Date: Sun, 15 Apr 2012 23:53:29 +0200
From: Frank Dittrich <frank_dittrich@...mail.com>
To: john-users@...ts.openwall.com
Subject: Finding words on which passwords are based (Was: .chr files ...)
On 04/15/2012 11:10 PM, Aleksey Cherepanov wrote:
> During the contest there were a lot of passwords based on words related to the
> contest. Most (if not all) of that were available on the contest's site.
>
> So if we know that we crack password from some company we could try to use
> words from this company's site or even from sites related to it's subject.
>
> It is a guess. Though automatic site ripper could be helpful.
As long as you'll have either passwords being built using simple
mangling rules or many saltless hashes or fast hashes, the most commonly
used passwords usually turn up very fast during the initial cracking
attempts, because they are often part of larger word lists.
Then, it is just a matter of seeing a pattern and finding more relevant
words.
So it often doesn't matter that much which basic words are favored,
"pocket monsters" or something else.
Once you have identified these favorite words, you can try more and more
complex mangling rules on them.
If you crack passwords from some company, those basic words could be
brand names, names of cities or streets where subsidiaries of this
company are located, and so on.
Depending on password policy, even month names (not just the English
ones, especially for international companies) or their abbreviations
also make good basic words.
Since the list of month names is extremely short (especially if you
first concentrate on those names that are used in multiple languages),
you can use a ridiculous amount of crazy mangling rules on those
passwords, and still be very effective cracking new passwords.
It would probably even make sense to try appending month names or their
abbreviations to all previously cracked passwords (start with most
frequently used passwords), use month names as password prefix, or
insert the month name somewhere in the middle...
And of course, first names are an all-time favorite for building passwords.
Use a list sorted by frequency, like collected here:
http://downloads.skullsecurity.org/passwords/facebook-firstnames-withcount.txt.bz2
Apply more complicated mangling rules only on the top n names (the size
of n also depends on the hash type), apply simpler rules to a larger set
of names.
Find out which names are frequently used in passwords, and apply more
rules on those.
Find out which rules are used frequently, and apply those on a larger
list of names or on other word lists...
Frank
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