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Message-ID: <87r238653i.fsf@gmail.com>
Date: Sat, 19 Oct 2019 20:02:41 +0300
From: Aleksey Cherepanov <lyosha@...nwall.com>
To: john-users@...ts.openwall.com
Subject: Re: approaches to use old password as baseword for new hash matching by username/login (as in CMIYC 2019)
Aleksey Cherepanov <lyosha@...nwall.com> writes:
> - mkpc is 8 for django-scrypt and plaintext formats. --mkpc=1
> option does not affect the increase of SingleWordsPairMax for
> these formats.
Wording is wrong: min. and max. KPC are 1 for django-scrypt format, but
KPC used by single mode is 8.
> Example of our script (reformatted):
> ----------------------------------------------------------------------
> while IFS=: read -r u p; do
> printf '%s\n' "$p" > twl &&
> grep -- "$u" results/uncracked/0.django-scrypt.slow-salted.target.pw &&
> echo "$u" &&
> ./JohnTheRipper/run/john \
> --users="$u,$u-a,$u-b,$u-c" \
> results/uncracked/0.*.target.pw \
> --wordlist=twl \
> --rules=': sq1 sw2 se3 sr4 st5 sy6 su7 si8 so9 sp0';
> done < results/pair_user_crack/14.raw-md5.fast-nosalt.log2.txt
> ----------------------------------------------------------------------
Option --skip-self-tests would improve performance in case 1 candidate
per salt. Not much though. The option was created for similar use cases.
Nevertheless with the trick with rules, single mode would be faster even
for 1 candidate per salt. It is not perfect now because there is
additional pass of hashing for every uncracked hash (issue #4111).
> # Copyright © 2016 Aleksey Cherepanov <lyosha@...nwall.com>
Of course, the year should be 2019. That's from old snippet for license.
Thanks!
--
Regards,
Aleksey Cherepanov
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