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Date: Thu, 9 Mar 2006 13:29:30 +0100
From: Turko <granturko@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: checking only first 5 characters of a md5 hash

Maybe I didn't explained in a good way (sorry for my english) :
the first 5 chars are not of the password, but they are the first 5 of the
md5 HASH.

So I know 5 first characters of the HASH for example "abc123xxxxxxxxxxx" ) ,
using John can I find all the passwords that have their encryption starting
with "abc123" ? Is this way faster then crack the entire HASH right? (abc123
can correspond to first part of many different hashes -> many possible
passwords -> the first I find is good) .

Is correct the idea? Becouse I don't know how the md5 algorithm works
exactly....

.Thanks.

On 3/9/06, rembrandt@...erlin.de <rembrandt@...erlin.de> wrote:
>
> > How can I tell John to get the substring of the hash and checking only
> its
> > 5
> > chars?
> >
> > .Thanks.
>
> As far as I know you can`t because for this john would have to know the
> keyspace to know where to start and where to end.
>
> Maybe I`m wrong but such a function is not implemented (as far as I know)
> but reducing the keyspace by using parts of the key you know or even the
> start of the plaintext-password is maybe a neat function... :-)
>
> E.g. if you just saw that xyz entered "At526" at the beginning of the
> passwords. Not that we spy passwords.. it`s more to speed up cracking
> passwords of users who left. :-))
>
> Kind regards,
> Rembrandt
>
>
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