It's a bird! No, wait, it's a WINDOWS BETA!

[Bitweasil]

I'm generating 4 NTLM len8 tables, and they'll be, combined, around 1.6TB. The plan is to sell them on a 2TB external drive.

As far as the generate program, it doesn't start if the number of chains is too high... it loads up, figures out it can't allocate enough GPU memory, and quits. It's the easiest, most straightforward way I can come up with. Adding a sanity check to tell you this a fraction of a second earlier is just wasting code space.

Len 2 000 000 chains: Per hash, you're looking at about 30 minutes per hash of candidate hash generation... with a GTX580. Pass.

Disk is cheap. As long as things fit on a 2TB external drive (actually, I'm happy if only one table per drive fits in the future with larger tables), the table size is fine. IMO.

[kevinkk5]

1.6 TB?? that´s crazy^^ the tables are a bit huge..

well 30 minutes per hash is not the worst.. if you bruteforce it with the same charset it takes you days^^ but having so many TB is not that funny if you need more harddisk just for a few RTs...
how long does it take to generate your RT?

[Bitweasil]

Yes, len8 full US charset is a large space to play in.

It usually takes me on the order of 3-6 GPU months per table index, so the NTLM len8 tables, when fully complete, will be representing about 2-3 GPU years of work.

The tables are a bit huge to keep the crack time down. I plan to ship the tables on an external hard drive, so you don't need to add internal drives unless you want.

And, yes, *ship* tables. Downloading them would take forever.

[kevinkk5]

that´s nice.. how long will you take for that? probably i won´t need them the next 2 years because i´ll make a social year in a foreign country.

i hope that virtualbox will be able to achieve this VT-d because then you would be able to connect your graphic card directly to the VM. That would make your work much easier because you won´t need to restart your pc in order to develop software in windows.

hopefully you can make some money with that table so that you can buy some new hardware.

[Bitweasil]

Well, I have a lot of GPUs on tap...

I've resolved the Windows dev issue by buying a netbook that supports CUDA. See my "Asus 1215N" blog posts and the recent release of Windows code.

You're always welcome to donate to my hardware fund. I make good use of the hardware I get with donations.

[pyr]

Hi,

I tried to crack 098F6BCD4621D373CADE4E832627B4F6 (MD5 for 'test') with the MD5 Length 6 full US charset tables,and the beta windows program, but it didn't find it..
The command line was "GRTCrack.exe -f hash.txt -h MD5 C:\GRT_MD5_Len6\[all].grt"

I am on Windows Vista 64bits. GPU : nVidia GTX260.

Does the program write the password to an external file that I didn't see ?

Regards.

[Bitweasil]

"test" is 4 characters. The table is len6 only. They do not cover "up to length" - they are that length only.

[pyr]

Oh sorry for my mistake That's exactly 6 chars ok.

For a password of length 6, is it faster (GPU speaking) to brute-force it or to use those rainbow tables ?

Thanks.

[Bitweasil]

Well, how fast is your GPU?

On my netbook, it's a ton faster to use rainbow tables.

It's probably faster, in general, to use the rainbow tables if you have a small number of hashes. Go up past say 50 hashes, and brute forcing starts to become appealing again.

[pyr]

Thanks.

Concerning the Windows Beta, I may have a problem with the crack under windows vista.
I have two ntlm hashes (len=7) which I try to crack:

61514A28D43347F553835D1E00B7D303:u2mgd1
3E5025CA7A3C03280D09511A6A511C47:gmp884

I always have the error "Password length 7 not supported!"

Why ?

Trace :

Code: Select all

Loaded 2 hashes!
Processing GRT file E:\GRT-NTLM-len7-fullcharset-perfect\NTLM-idx0-chr95-cl200000-perfect.grt

Table version:   1
Hash:            NTLM
Password length: 7
Table index:     0
Chain length:    200000
Num chains:      444148604
Perfect table:   Yes
Charset length:  95
Charset:          !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQR
                 STUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~


Running group 1 of 7
Kernel Time: 1.172 ms  Done: 8.14%
...

Total time: 124.16 seconds
Average rate: 171.09 M h/s
Thread 0 completed workunit ID 2 / 2
Thread 0 out of workunits
GPU memory freed... SHOULD be returning...
Threads joined
Total candidate hashes before unique removal: 600000
Total candidate hashes after unique removal: 599801
Using index file E:\GRT-NTLM-len7-fullcharset-perfect\NTLM-idx0-chr95-cl200000-perfect.grt.idx, 16777216 indexes
Index file bits to index: 24

Step 0 / 599801 (0.00%) 0 chains found       
...

Total chains found to regen before merging: 344513
Total chains found to regen after merging: 344513

Got 344513 chains to regen.
Number of hashes to search for: 2
Password length 7 not supported!


Thanks for help.