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Date: Wed, 23 Jan 2013 20:40:52 +0100
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: Min password length
On 23 Jan, 2013, at 19:02 , magnum <john.magnum@...hmail.com> wrote:
> On 23 Jan, 2013, at 18:43 , Frank Dittrich <frank_dittrich@...mail.com> wrote:
>> On 01/23/2013 06:25 PM, magnum wrote:
>>> BTW we need some systematic testing of these new options.
>>
>> I knew how --min-length=N and --max-length=N work for --incremental and
>> --markov (tested this in the past).
>> After my last reply to Jim I tested it with --wordlist (with and without
>> --rules), and was just thinking about how to test it for --single mode
>> (since --single doesn't work well with --stdout).
>
> The mechanisms for this are in the rules engine, so if it works fine for Wordlist it ought to work fine for Single. We should double check it though.
Here's the official magnum-one-liner[tm] for testing (not Single though):
$ ../run/john --stdout -wo -ru | perl -e 'while (<>) { chomp; $len{ length($_)}++; } foreach $len (keys(%len)) { printf "%02d: %d\n", $len, $len{$len}; }' | sort -n
words: 156846 time: 0:00:00:00 DONE (Wed Jan 23 20:34:28 2013) w/s: 1206K current: Sssing
00: 1
01: 6
02: 4
03: 388
04: 5408
05: 13276
06: 28677
07: 47502
08: 29579
09: 18777
10: 7173
11: 2114
12: 3801
13: 81
14: 55
15: 2
16: 2
Now, add a max format length (ie. --stdout=10) and try again. Due to truncation, the figure for 10 goes up. Then also add --max-len=10 and try again. It goes down again. Add a --minlen, throw in rules, external filters and so on.
magnum
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