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Date: Wed, 14 Sep 2016 21:32:19 +0200
From: Marek Wrzosek <>
Subject: Re: Error: wordlist contains NULL bytes - aborting

W dniu 14.09.2016 o 16:49, jfoug pisze:
> These have a carriage return in them (the 0d).  There are 3 characters
> which are very hard to deal with in JtR.  That is \x00 (null), \x0a and
> \x0d (line feed and carriage return).  Also, the ':' can be tough in
> certain situations (but is not a problem for an input wordlist).  The
> \x0a and \x0d 'can' be handled in wordlist (using rules, external or
> mask).  I am not sure if john can (or ever will) be able to handle a
> null byte.  It may be that we can handle them with mask mode, I am not
> sure.  It will almost certainly never be able to handle embedded null
> bytes in wordlist mode

Hi jfoug,

If the problem is storing those passwords in pot file, maybe
percent-encoding (like in URLs) would do the trick. It should be
backward compatible - the old pot file will work with new john, but not
the other way around.

Best regards,

Marek Wrzosek

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