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Full Version: Openwall cracker ?!
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Hi,

Have you seen this twitt ?
https://twitter.com/HashSuite/status/427671690319892480

Quote:As far as we're aware, Hash Suite 3.0 is now world's fastest LM hash cracker on CPU and GPU: 5350M c/s on 7970GE (vs. oclHashcat's <1400M)

From openwall : https://hashsuite.openwall.net/performance

I will test it tomorrow but.. 5350M c/s VS 1400M c/s that's a huge difference !
Any hints ?
Keep cool, there's no magic involved.

What this program is using is a technique called bitslice. DES based algorithms like LM can be improved alot by using bitslice compared to "traditional" techniques.

The original bitslice DES/LM source was posted on reddit a while back and at this time it was doing around 3000M c/s. I was able to improve it to around 6400M c/s which is actually faster than Hash Suite 3.0, you can read about here: https://www.reddit.com/r/crypto/comments/...e/#c7sm2c3

Again, this technique works only for LM hashes, but for LM hashes you should use rainbow tables. If you really need to brute-force the entire 95^7 keyspace you can do that in less than a day on 1400M c/s since the algorithm is so designed that the keyspace is so small.
The "full" keyspace is 69^7 so 1.5 hours vs 24 minutes.

Unless you add in foreign characters. These change depending on the system's code page. I tried to figure out the mapping and failed because I didn't know that it was depended on the system's code page. I got 105 characters with the English code page. Anyway it really only matters if you say fuck it and do the full full keyspace of 2^56.
(01-27-2014, 07:20 PM)atom Wrote: [ -> ]The original bitslice DES/LM source was posted on reddit a while back and at this time it was doing around 3000M c/s. I was able to improve it to around 6400M c/s which is actually faster than Hash Suite 3.0

Thanks for the clarification.
Why oclhashcat does not implement it ?
Considering oclhashcat last version and this command line :
Code:
-a 3 -m 3000 -n 160 --markov-disable -i --increment-min 1 --increment-max 7 -1 ?u?d?s 1000_hashes.txt ?1?1?1?1?1?1?1

Speed is ~1200 Mh/s, duration ~1h30.
ATI 7970

1/ Any hints to speed it up ?
2/ is "?u?d?s" the same behaviour as "?a" when bruteforcing LM ?

Thank you.