Date: Tue, 27 Feb 2007 17:39:46 +0300 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: Splitting the Charset into chunks On Mon, Feb 26, 2007 at 09:32:08PM +0100, Pablo Fernandez wrote: > I'm trying to find a way to split any charset into a given (very high) number > of disjoint chunks and then create a new charset file with each chunk. While there's a way to split a charset file like that, exactly the same effect is better achieved by having the code in inc.c skip some order entries. The number of chunks won't be very high, though - there will be just a few hundred of reasonably large ones (with order indices of around 2000 for the default CHARSET_* parameters). There's no better way to split the charset files, assuming that the code in JtR remains unchanged; even if you would drop some characters from some character positions, those characters would be re-added with inc.c: expand(), so your different nodes would eventually be trying the same candidate passwords and they would do so in a less optimal order. > Maybe the code used to create the default ones may help? Is it available? Yes, the code is available - it's just the --make-charset option to JtR and the corresponding code is found in charset.c. > Also I found it very difficult to understand the insights of a charset file, > I have seen no documentation about it in the code. Is there any? It's just the comments in charset.h. -- Alexander Peslyak <solar at openwall.com> GPG key ID: 5B341F15 fp: B3FB 63F4 D7A3 BCCC 6F6E FC55 A2FC 027C 5B34 1F15 http://www.openwall.com - bringing security into open computing environments Was I helpful? Please give your feedback here: http://rate.affero.net/solar -- To unsubscribe, e-mail john-users-unsubscribe@...ts.openwall.com and reply to the automated confirmation request that will be sent to you.
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