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Date: Thu, 2 Apr 2020 19:50:55 +0200
From: Solar Designer <>
Subject: Re: Password length gets shorter with time

On Thu, Apr 02, 2020 at 10:33:44AM +0300, Sky Diver wrote:
> Running on Ubuntu 18.04 I started with the following
> Warning: detected hash type "rar", but the string is also recognized
> as "rar-opencl"
> Use the "--format=rar-opencl" option to force loading these as that type instead

If you have a GPU, you could actually give that option a try.  Since you
already have the attack on CPU running for 49 days, you may keep that
one running and run a different attack using your GPU, e.g.:

./john --session=gpu -w=rockyou.txt --format=rar-opencl rarhash.txt

> Using default input encoding: UTF-8
> Loaded 1 password hash (rar, RAR3 [SHA1 256/256 AVX2 8x AES])
> Will run 8 OpenMP threads
> Proceeding with single, rules:Single
> Got to the sequential/incremental phase and it's been a while.
> Looking at the progress from time to time I saw the following:
> 0g 42:06:53:12  3/3 0g/s 271.7p/s 271.7c/s 271.7C/s l0su2412..l0sup154
> 0g 46:12:31:51  3/3 0g/s 268.9p/s 268.9c/s 268.9C/s nigdbb3..nigf4it
> 0g 49:05:22:47  3/3 0g/s 267.6p/s 267.6c/s 267.6C/s ej1rlb..eje4k2
> The number of chars got to 8 then 7 then 6.
> Is this a bug or a feature?

Like magnum correctly said, it's a feature.  Incremental mode switches
lengths back and forth as it slowly increases the number of different
character indices that it includes in the candidate passwords.  You can
find out what goes on under the hood by looking at the john.log file.


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