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Date: Tue, 19 May 2015 19:35:58 +0100
From: Demian Smith <demian.smith@....de>
To: john-users@...ts.openwall.com
Subject: Re: Advise on best approach (truecrypt pw based on pdf
file)
Thanks a million, Marek, that’s reaaaaly great work.
I run it on my "allpdf" file as well as on the relevant pdf#s of the
books. I'm pretty confident that by now it should have been cracked,
alas, it isn't.
I right now run the two filters on the first txt file I create from the
suspect pdf and will then go back to incremental, as the Markov mode -
in my case - does not appear to be producing useful candidates.
Thanks again for all the effort, I'm pretty sure this is a layer 8 issue
right now :s
Demian
★ On 15/05/18 10:17 p.m. Marek Wrzosek wrote ★
> Hi
>
> Finally I got it. Two (almost) perfect filters. Almost because they are
> made from two awk commands and one has grep in it also. First will print
> only once every substring that start with capital letter. First awk
> ignores 'I' when searching for next substring, so second awk will repeat
> all substrings that start with 'I'.
> And this is that first filter:
> env LC_COLLATE=C awk '{line=$1;while(match(line,/[A-Z][a-zI]+/)>0){print
> substr(line,RSTART,RLENGTH);line=substr(line,RLENGTH+1);}}'|awk
> '{line=$1;print
> line;while(match(line,"I")>0){if(RSTART>1){line=substr(line,RSTART);print line;}else
> line=substr(line,2);}}'
>
> Second filter is almost like that from previous e-mails but it will not
> stop after 12 letters. It consists first awk from previous filter but
> second awk comes from previous e-mail (with grep).
> This is second filter:
> env LC_COLLATE=C awk '{line=$1;while(match(line,/[A-Z][a-zI]+/)>0){print
> substr(line,RSTART,RLENGTH);line=substr(line,RLENGTH+1);}}'|awk
> '{for(i=1;i<=length($1);i++){for(j=i+4;j<=length($1);j++){print
> substr($1,i,j-i+1);}}}'|grep '^[A-Z]'
>
> You can use unique command from JtR to get rid of repeated passwords.
> I think that passwords from first filter (after unique) can be good as
> training sequence for Markov model (but I'm not sure).
>
> Best Regards
>
> W dniu 18.05.2015 o 20:50, Demian Smith pisze:
>> Hi Marek,
>>
>> thanks a mill for the quick reply - slowly this is feeling like I have
>> taken over the john list :p
>>
>> I am creating the wordlist right now with your new command, if that
>> fails, I will run Markov, if that fails as well, I run incremental
>> forever and a day ...
>>
>>> I've been thinking about rewriting this awk command to search a capital
>>> letter other than 'I' at the end of string to break the inner loop.
>>> Maybe I'll get rid of grep and change loop type.
>>
>> I hope all of this will help someone else eventually as well =) and I
>> can't point out enough how grateful I am for the ongoing help on this list
>>
>> Best regards and thank you ever so much,
>> Demian
>>
>>
>>
>>
>>
>> ★ On 15/05/18 07:42 p.m. Marek Wrzosek wrote ★
>>> Hi Demian
>>>
>>> There should be space between grep and '^[A-Z]'. The ^[A-Z] regular
>>> expression is for searching lines with a capital as first letter.
>>> I've been thinking about rewriting this awk command to search a capital
>>> letter other than 'I' at the end of string to break the inner loop.
>>> Maybe I'll get rid of grep and change loop type.
>>>
>>> Best Regards
>>>
>>> W dniu 18.05.2015 o 18:32, Demian Smith pisze:
>>>> Hi Marek,
>>>>
>>>> I tried Markov over night , but it doesn't look really good - I had
>>>> trained it on a pwd file generated from the pdf (with keeping only first
>>>> letters of each word), but it cretaed mostly candidates like
>>>> titttttttttttaief
>>>>
>>>> So, I wanted to get back to the awk version and run it on a similar file
>>>> created from the pdfs in the relevant folder, alas, I get
>>>> cat all5 | awk '{for (i = 1; i <= length($1);
>>>> i++){for(j=i+4;j<i+12&&j<=length($1);j++){print substr($1, i,
>>>> j-i+1);}}}' | grep'^[A-Z]' > all6
>>>>
>>>> grep^[A-Z]: command not found
>>>>
>>>> I don't know enough about bash programming to sort this one out and
>>>> hence would come back to your advise, if you don't mind ...
>>>>
>>>> Thanks,
>>>> Demian
>>>> --
>>>> 'It's no measure of mental health to be well adjusted
>>>> to a profoundly sick society.'
>>>>
>>>> Sinéad O'Connor
>>>>
>>>> ★ On 15/05/18 04:57 a.m. Marek Wrzosek wrote ★
>>>>> awk '{for (i = 1; i <= length($1); i++){for
>>>>> (j=i+4;j<i+12&&j<=length($1);j++){print substr($1, i, j-i+1);}}}'|grep
>>>>> '^[A-Z]'
>>>
>
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