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Date: Wed, 3 Jan 2007 19:53:51 +0100
From: websiteaccess <websiteaccess@...il.com>
To: john-users@...ts.openwall.com
Subject: Incremental mode VS specific rules mode
Hi,
This is the question of the day. What is more efficient: Incremental
alpha mode (-i:alpha) or -rules for cracking large amount of HASHED ?
------ GOOD/BAD for incremental mode -----
GOOD : incremental mode crack really fastly little words (with 6, 7
characters)
GOOD : no writing of boring rules
BAD: incremental test all possibility ! Even with a to z, it can take
really long time (especially for passwords with more than 10 characters)
------ GOOD/BAD for rules mode -----
GOOD : the rules are powerfull.
GOOD : with rules we can test only highly probably possible passwords
(with
some variations).
GOOD : can test passwords more than 8 letters
BAD : we have to write rules :( sometimes really boring.
In this project I test my own new rules based on statistics frequencies
letters (each language has his own frequency).
I do test with raw-md5 hashes (allow passwords with more than 8
letters).
NOTE: JTR with incremental is not able (with the basic JTR) cracking
words longer than 8 letters, with my rules there is no limit (12 or 13
letters seems already strong password).
My rules are specific for french passwords. I will do others rules for
others language if needed.
Of course, my actual rules can crack non-french words, but, there are
more powerfull with french words.
I have tested in first -i:alpha with a 2128 hashes, then the same
hashes with my rules.
In 2128 hashes, may be (and surely) there is a lot of passwords
composed with (only may be) digits. These hashes will not be volontary
cracked.
I only test my rules contains only alpha (a to z), and incremental
mode (-i:alpha) will use only a to z (not A-Z or/and 0-9). In this way,
we can compare the same jobs.
My project was do rules for crack maximum hashes in a minimum time.
I give you some results, let's compare :
p a s s w o r d s f o u n d w i t h
length words ∙ MODE -i:alph ∙ mode -rules
------------------------------------------------
12 ∙ 0(*) ∙ 0
11 ∙ 0(*) ∙ 1
10 ∙ 0(*) ∙ 10
9 ∙ 0(*) ∙ 34
8 ∙ 82 ∙ 135
7 ∙ 166 ∙ 173
6 ∙ 392 ∙ 341
5 ∙ 64 ∙ 61
4 ∙ 49 ∙ 47
3 ∙ 8 ∙ 0(**)
------------------------------------------------
∙ 761 ∙ 802
------------------------------------------------
time ∙ 12 h 06 ∙ 9 h 02
elapsed ∙ (still cracking) ∙ (100% done)
------------------------------------------------
(*) incremental mode, can't crack passwords with more 8 letters
(**) rules are not configured for cracking words less 4 letters.
Finally, it seems rules crack more passwords in less time.
"Rules mode" has cracked 45 words with more 8 letters (hardest
to crack) in less time than incremental mode (- 3h04mn)
Hope this test can be usefull for someone.
-- Websiteacces --
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