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Date: Mon, 24 Sep 2012 16:46:24 -0400
From: David Jones <jonesd@...umbus.rr.com>
To: john-dev@...ts.openwall.com
Cc: David Jones <jonesd@...umbus.rr.com>
Subject: Re: GECOS + single mode problem in JtR
On Sep 24, 2012, at 1:42 PM, magnum wrote:
> On 24 Sep, 2012, at 16:17 , Dhiru Kholia <dhiru.kholia@...il.com> wrote:
>
>> vmsdump file (attached) has the actual passwords in the GECOS field.
>> However, john still fails to crack the hashes. Any ideas why?
>>
>> After manually extracting the passwords from the GECOS field and using
>> them as input dictionary, john successfully cracks all the hashes.
>>
>> Is single cracking mode broken?
>
> From a quick look I believe it properly cracks all ASCII plaintexts. The input file is in ISO-8859 format. How are 8-bit characters handled by this format? This may or may not be just an incorrectly made test file.
>
The format doesn't do any special treatment of 8-bit characters in passwords. Loader.c would seem to be parsing the GECOS field into words using using separator characters that are in the password (e.g. '*').
>>Dave
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