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Message-ID: <BAY120-W33A7573966006DBD0F0772B0BC0@phx.gbl>
Date: Mon, 9 Feb 2009 07:20:23 +0000
From: P PO1434 <p2409@...mail.com>
To: <john-users@...ts.openwall.com>
Subject: 2 known letters + wordlist word --> is new format definition best
way?
Hello there John users
I'm really enjoying my foray into John at the moment. Thanks to Alexander and all contributors.
I have a question regarding a long list of partially known passwords that use a simple MD5 hash. In my case, I know the first 2 characters (digits), however I would like john to use the wordlist
for the remaining characters.
My options seemed to me to be:
1) Make a new rule in [List.Rules:Single]
^[0-9]^[0-9]
This worked quite well, but of course not I'm not using the known digits, so 100 x slower than necessary.
2) Make an external/incremental rule like the one in the wiki that forces the 2 digits in at the front, then goes through every combination of alpha letters.
Not very efficient, given I expect the word will be in list.
3) Write a xxx_fmt.c based on rawMD5go_fmt.c
Struggling with this at the moment, but it looks like the best option (?)
My questions are:
a) Am I even barking up the right tree creating a new xxx_fmt.c based on rawMD5go_fmt?
b) If a new fmt is the right way, will it be a matter of just 'overriding' the set_key function?
c) Is it possible/correct to create external rules that use a wordlist, or are these rules just exhaustive searches?
Thanks for any info people can provide..
Cheers
Pete
Get what you want at ebay. Get rid of those unwanted christmas presents!
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