Partially reverse MD4

Please support our Computer Science advertiser: Learn about neural networks and artificial intelligence.
Reply

Join Date: May 2008
Posts: 374
Reputation: Clockowl is on a distinguished road 
Solved Threads: 27
Clockowl's Avatar
Clockowl Clockowl is offline Offline
Posting Whiz

Partially reverse MD4

 
0
  #1
Oct 20th, 2008
Hey guys,

I'm trying to create an MSCache (2 times MD4) cracker. I took the RFC thingy and implemented it in a cracker which is.. fast, but not as fast as I'd like it to be. So I searched a bit and stumbled on MDCrack, which claims it can do about 10 million MD4 hashes per second on my system, while I only get 4 million per second.

Since it's open source, I downloaded the source code of an old version and studied the MD4 algorithm, and it seems to partially reverse it. However, I lack knowledge of just about everything considering hashes and was wondering if someone here could teach me one or two things as the weaknesses of these cryptographic functions, how you would create secure ones and of course how to attack one.

Thanks in advance,
Nick
Last edited by Clockowl; Oct 20th, 2008 at 10:02 am.
Reply With Quote Quick reply to this message  
Join Date: Jun 2009
Posts: 33
Reputation: dzhugashvili is an unknown quantity at this point 
Solved Threads: 0
dzhugashvili dzhugashvili is offline Offline
Light Poster

Re: Partially reverse MD4

 
0
  #2
Jun 19th, 2009
Hello. I believe you can reverse the fourth and perhaps part of the third rounds of the external MD4, but nothing more.

here is open source code for a cracker implementing reversal and SSE2 for mscache:
http://blog.distracted.nl/2009/05/ca...te-forcer.html

could you direct me to the RFC for mscache? Can't find it.

about hash reversal:
http://3.14.by/forum/viewtopic.php?f...3d461d4579727f
Reply With Quote Quick reply to this message  
Reply

This thread is more than three months old.
Perhaps start a new thread instead?
Message:



Other Threads in the Computer Science Forum
Thread Tools Search this Thread



About Us | Contact Us | Advertise | DaniWeb | Acceptable Use Policy | RSS Feed

©2003 - 2009 DaniWeb® LLC