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+--- Thread: O H/sec with PhpBB (/thread-3013.html)
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O H/sec with PhpBB - Mem5 - 01-12-2014
Hi,
Considering thousand of PHPBB hashes.
I launched a dictionnary attack, I got ~400 H/sec.
GPU : 7970.
I then lauch a bruteforce attack on digits :
Code:
oclhashcat64.exe --remove -n 160 -u 8 -a 3 -m 400 -i --increment-min=1 --increment-max=12 -1 ?d phpbb.txt ?1?1?1?1?1?1?1?1?1?1?1?1Session.Name...: oclHashcat
Status.........: Running
Input.Mode.....: Mask (?1) [1]
Hash.Target....: File (phpbb.txt)
Hash.Type......: phpass, MD5(Wordpress), MD5(phpBB3)
Time.Started...: Sun Jan 12 22:02:18 2014 (1 min, 1 sec)
Time.Estimated.: 0 secs
Speed.GPU.#1...: 0 H/s
Recovered......: 0/13681 (0.00%) Digests, 0/13681 (0.00%) Salts
Progress.......: 44650/136810 (32.64%)
Rejected.......: 0/44650 (0.00%)
1 digit : 0 H/sec. Why 0 H/sec ?
Few minutes after :
Session.Name...: oclHashcat
Status.........: Running
Input.Mode.....: Mask (?1?1) [2]
Hash.Target....: File (phpbb.txt)
Hash.Type......: phpass, MD5(Wordpress), MD5(phpBB3)
Time.Started...: Sun Jan 12 22:02:18 2014 (30 secs)
Time.Estimated.: Sun Jan 12 22:08:41 2014 (2 mins, 44 secs)
Speed.GPU.#1...: 1 H/s
Recovered......: 0/13681 (0.00%) Digests, 0/13681 (0.00%) Salts
Progress.......: 219300/1368100 (16.03%)
Rejected.......: 0/219300 (0.00%)
2 digits : 1 H/sec.
Etc... 3 digits : 10 H/sec ; 4 digits 21 H/sec..
Am I doing something wrong with the command line ?
Why dictionnary attack gives 400 H/sec but simple digit bruteforce is slower ?
I tried changing -n and -u but this is the same.
Thanks.
RE: O H/sec with PhpBB - radix - 01-12-2014
take the tuning options off and see what happens.
RE: O H/sec with PhpBB - Mem5 - 01-12-2014
It's the same without -n and -u
RE: O H/sec with PhpBB - atom - 01-12-2014
to many salts
RE: O H/sec with PhpBB - Mem5 - 01-13-2014
Does this imply a hashes limit ?
I should divide the list in 2 or 3 or more ?
RE: O H/sec with PhpBB - epixoip - 01-13-2014
for salted algorithms, each plaintext candidate has to be hashed with each unique salt. therefore when cracking salted hashes, your effective speed is the total speed divided by number of unique salts. so if your single salt performance is 400 H/sec and you have 13681 unique salts, then your effective speed is 0.03 H/sec. the only way to speed this up is to eliminate salts as quickly as possible. this is accomplished by stacking your attacks in probabilistic order, so that you remove as many salts as possible in your first few passes.
RE: O H/sec with PhpBB - Mem5 - 01-13-2014
Ok.
Quote:this is accomplished by stacking your attacks in probabilistic order, so that you remove as many salts as possible in your first few passesHow can I do that ?
RE: O H/sec with PhpBB - undeath - 01-13-2014
thinking.
RE: O H/sec with PhpBB - Mem5 - 01-13-2014
Hum.
I mean, I am not english, and I did not really understand what epixoip explained, especially last sentence.
If I remove (erase?) salts, I also delete the hash, right ? but that is not what I want..!
RE: O H/sec with PhpBB - undeath - 01-13-2014
not erase but crack. start with small wordlists which have a high hit probability.