Defining an algorithim - Printable Version

Defining an algorithim - Printable Version

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Defining an algorithim - savvamadar15 - 09-26-2013

I need to crack an sha256 hash

I know that the encrypted string follows this pattern

#-XXXXXXXXXX

#= A number generated between 1 and 25
X= Character generated from one of the below

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890

So it could be something like this:

20-2lje2ezTvu

or

2-wa4tnSoYWB

I wrote a code for this in java but that uses CPU and is super slow.
Assuming I use hashcat-gui and oclHashcat-lite what exactly do I put in.
Anyone interested in the java code: http://pastebin.com/fqddhKjJ

Thanks for the help everyone!

RE: Defining an algorithim - epixoip - 09-26-2013

what you want to do is a mask attack.

http://hashcat.net/wiki/doku.php?id=mask_attack

RE: Defining an algorithim - savvamadar15 - 09-26-2013

(09-26-2013, 06:38 AM)epixoip Wrote: what you want to do is a mask attack.

http://hashcat.net/wiki/doku.php?id=mask_attack

As helpful as that was I still don't get how I generate a random number between 1-25. Because it can't be 01,02,03,...,23,24,25. It has to be 1,2,3,...,23,24,25.

RE: Defining an algorithim - epixoip - 09-26-2013

break it up and use a different mask for each pass. nothing says you have to do it all at once...

-1 ?l?u?d ?d-?1?1?1?1?1?1?1?1?1?1
-1 ?l?u?d 1?d-?1?1?1?1?1?1?1?1?1?1
-1 ?l?u?d -2 12345 2?2-?1?1?1?1?1?1?1?1?1?1

RE: Defining an algorithim - philsmd - 09-26-2013

... pro tip: with oclHashcat-plus and a .hcmask file you could do it all at once (one run of oclHashcat-plus only Wink

Code:
$ cat my.hcmask

?l?u?d,?d-?1?1?1?1?1?1?1?1?1?1

?l?u?d,1?d-?1?1?1?1?1?1?1?1?1?1

?l?u?d,12345,2?2-?1?1?1?1?1?1?1?1?1?1

RE: Defining an algorithim - savvamadar15 - 09-26-2013

(09-26-2013, 07:06 AM)epixoip Wrote: break it up and use a different mask for each pass. nothing says you have to do it all at once...

-1 ?l?u?d ?d-?1?1?1?1?1?1?1?1?1?1
-1 ?l?u?d 1?d-?1?1?1?1?1?1?1?1?1?1
-1 ?l?u?d -2 12345 2?2-?1?1?1?1?1?1?1?1?1?1

Thanks, I made a .bat with these parameters:

How do I enable all 3 masks? I'm sorry I'm very new with this.

RE: Defining an algorithim - savvamadar15 - 09-26-2013

(09-26-2013, 07:28 AM)philsmd Wrote: ... pro tip: with oclHashcat-plus and a .hcmask file you could do it all at once (one run of oclHashcat-plus only ).

Code:
$ cat my.hcmask ?l?u?d,?d-?1?1?1?1?1?1?1?1?1?1 ?l?u?d,1?d-?1?1?1?1?1?1?1?1?1?1 ?l?u?d,12345,2?2-?1?1?1?1?1?1?1?1?1?1

Sorry but how exactly do I do this>

RE: Defining an algorithim - philsmd - 09-26-2013

You can use any text editor you want to create a file called my.hcmask (or whatever you want to call it), put the content I just showed you:

Code:
?l?u?d,?d-?1?1?1?1?1?1?1?1?1?1

?l?u?d,1?d-?1?1?1?1?1?1?1?1?1?1

?l?u?d,12345,2?2-?1?1?1?1?1?1?1?1?1?1

in the file and use it in your command line as such:

Code:
oclHashcat-plus64.exe --hash-type 1400 --attack-mode 3 --force XXXXb97304ab69679f4XXXX7fa80608cXX5cbec61cb2XXX916d3cXXXa4eabXXX

my.hcmask

Also please remove the hash you just posted ASAP (see: https://hashcat.net/forum/announcement-2.html , edit the post and e.g replace the hash with this one: XXXXb97304ab69679f4XXXX7fa80608cXX5cbec61cb2XXX916d3cXXXa4eabXXX )

RE: Defining an algorithim - epixoip - 09-26-2013

it wouldn't be worth using plus just for hcmask support due to the performance hit.

RE: Defining an algorithim - powderspecial600 - 10-25-2013

Is the plan to add support for hcmask files in lite at some point?