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3.14.by forum • sha 512 decode
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sha 512 decode

Posted: Wed Nov 25, 2009 4:37 pm
by md5
hello,
does any1 know a tool to decode new ubuntu hash? its salted sha512 in format:

Code: Select all

test:$6$yWddPuJ18g/DV$0VbRHPvd6XX/kfumQPT.aXLHKDKOZ0euSYd3jXzbvz5tusXRa7rnXAtyZtO7oz4YK9SG4CC8s/EhPB9cqNiVn/:14406:0:99999:7::: 

Re: sha 512 decode

Posted: Fri Nov 27, 2009 7:54 am
by LordMike
No.. No.. No...

No, we cannot 'decode' it.. It's hashed!
No, we won't crack it for you. It's not a public service thing.
No, Bars doesn't yet have support for SHA512 (Not even non-salted)..

On the other hand. Will be nice when SHA512 *is* implemented :)

Re: sha 512 decode

Posted: Sun Nov 29, 2009 12:29 pm
by BarsMonster
budden wrote:no sense I guess, the speed will be low as hell.
Low is better than zero anyway :crazy:

Re: sha 512 decode

Posted: Mon Nov 30, 2009 1:17 am
by IvanG
The speed won't be that bad actually. If it's just single sha-512 transform it'll be still millions per second.

Haven't tested sha-512 itself but sha-256 used in acrobat 9+ and it's running at ~70M/sec rate with GTX260 (AFAIR, done this almost year ago).

As vars for sha-512 extended to 64 bits (from 32 for sha-256) and number of rounds to 80 from 64 we can expect that sha-512 will be 3-4 times slower than sha-256.

Re: sha 512 decode

Posted: Mon Nov 30, 2009 6:59 pm
by Sc00bz
The default number of rounds is 5000. Each round may use up to 3-4 SHA512s.

Re: sha 512 decode

Posted: Tue Dec 01, 2009 11:27 am
by IvanG
Sc00bz wrote:The default number of rounds is 5000. Each round may use up to 3-4 SHA512s.
So it means that speed will be even slower than for RAR 3.x archives, in best case -- several thousands per second on top-end GPUs. Cruel world :).
budden wrote:I wonder what would be DES speeds for ATI... Seems like that old algorithm is still a badass for cracking. EGB's speed is lower than Core2Duo and i5/i7 CPU's on 2.5+GHz
DES programmed in "normal" way (i.e. without bitslice) is very GPU unfriendly because of s-boxes usage and algorithm complexity itself. For ATI GPUs it's even worse because of different memory model used (especially for anything below 5000 series). I guess it's impossible (or very hard) to implement fast "normal" DES on ATI GPUs, so bitslice is a must here. But bitslicing requires pre and post processing steps, so making estimations isn't trivial thing. I think that it's possible to reach high speeds with ATI for bitsliced DES but it requires a lot of programming. And with current ATI SDK quality chances to see ATI DES cracker aren't very high I guess.