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Message-ID: <41895DB2E77148AC8C5399C8ABE8D2D0@apple9d23c8f76>
Date: Sat, 5 Jan 2013 15:07:18 +0100
From: "JohnyKrekan" <krekan@...nykrekan.com>
To: <john-users@...ts.openwall.com>
Subject: Re: Incremental attack properties questions
Good afternoon, Thanx for your valuable feedback. Since I only need wordlist
without special national characters (all words in Slovak language can be
written with standard a..z characters) I managed to create my custom.chr
without any filters.
When I made same test and compared the statistical results, this new charset
performs much better.
For example in generating 6 character words, the standard alpha.chr had a
success of around 34 %, my new charset has success rate about 76 %.
thank you for help.
Best Regards
Jan Krekan
----- Original Message -----
From: "Frank Dittrich" <frank_dittrich@...mail.com>
To: <john-users@...ts.openwall.com>
Sent: Saturday, January 05, 2013 2:29 PM
Subject: Re: [john-users] Incremental attack properties questions
> On 01/05/2013 01:11 PM, Frank Dittrich wrote:
>> Since Markov mode generates words based on 2-byte-frequencies, and since
>> it generates passwords shorter than maximum length, there will be a
>> non-neglectable number of words with invalid utf-8 characters,
>> especially at the end of the word. So you might need to combine --markov
>> with an --external filter.
>
> If you don't want to write a general-purpose utf-8 validity check, but
> just one which checks --markov output based on stats files which have
> been generated using a word list encoded in (valid) UTF-8, then this
> task is quite simple:
>
> If the last byte is < 0x80, the word is valid.
> Else if the last byte is > 0xbf, the word is invalid.
> Else if the second to last byte is >= 0xc0 and <= 0xdf, the word is valid.
> Else if the third to last byte is >= 0xe0 and <= 0xef, the word is valid.
> Else if the forth to last byte is >= 0xf0 and <= 0xf7, the word is valid.
> Else the word is invalid.
>
> Frank
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