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Date: Tue, 21 Feb 2017 15:53:06 +0100
From: magnum <john.magnum@...hmail.com>
To: john-users@...ts.openwall.com
Subject: Re: How to Specify a Specific Password Pattern
On 2017-02-21 13:16, Albert Veli wrote:
> On 02/20/2017 11:08 PM, Mike Laufer wrote:
>> The password I'm trying to recover has a very specific pattern. What
>> is the best way to specify this pattern to john to minimize the time
>> it takes to find the password? For example, if I want to specify that
>> the first character of the password is an upper case letter, followed
>> by a lower case letter, followed by 2-3 upper or lower case letters
>> followed by 1-2 digits, how do you configure this?
>>
>> Thanks!
>
> You could do it in four runs:
>
> john ... -mask=?u?d?u?u?d?d
> john ... -mask=?u?d?l?l?d?d
> john ... -mask=?u?d?u?l?d?d
> john ... -mask=?u?d?l?u?d?d
>
> You could probably use some syntax to squeeze this into one single mask.
> Not sure how. Check out the doc/MASKS file. It should be possible to use
> a mask like:
>
> ?u?d[a-zA-Z][a-zA-Z]?d?d
That last notation is supported too. Another way to say the same is
using a custom placeholder, here declared with -4=(...) and referenced
with ?4, (1..9 are supported) for upper/lower:
./john ... -4=?l?u -mask=?u?d?4?4?d?d
Also, if the mask is shorter than needed, last placeholder will be
repeated. So this will do 1 *or* 2 digits in the end:
./john ... -4=?l?u -mask=?u?d?4?4?d -min-len=5 -max-len=6
But you'll still need a separate run for 3 upper/lower-case letters
before the digits:
./john ... -4=?l?u -mask=?u?d?4?4?4?d -min-len=6 -max-len=7
Mask mode requires Jumbo though, and I recommend a build from recent
GitHub source rather than Jumbo-1 release, which is way old.
magnum
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