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Date: Wed, 13 Feb 2013 19:58:15 +0100
From: Simon Marechal <simon@...quise.net>
To: john-users@...ts.openwall.com
Subject: Re: RAR Cracking with JtR Jumbo (Files found during
 forensics)

On 02/13/2013 07:37 PM, magnum wrote:
> RAR speed is highly dependant on password length. Length 4 is significantly faster than length 8. Our GPU benchmark use length 6. The speed suffers as soon as *any* password in a keys-per-crypt batch is longer. Unfortunately this is often the case for wordlist runs. You can mitigate it by sorting the file by length but adding --rules to the mix will render that effort pointless.

It is so slow that it is worth generating the password candidates with
--stdout, sorting them, and then crack without rules. You will not get
optimal rule application order, but if you know how long you are
prepared to wait that might be your best best.

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