hashcat Forum

Hi

I use cudaHascat and try to break "crypt" passwords with a dictionnary+rules file (Hardware: 3x Nvidia K10)

I think i have an issue with the speed (Very slow) compared to benchmarks. 112.7 kH/s is'nt very fast. When i use benchmark-mod=1 with "crypt", i have: 128.3 MH/s

An other strange thing is the number of rejected hash (almost 100% ?) How is it possible ?

Session.Name...: cudaHashcat
Status.........: Running
Rules.Type.....: File (cudaHashcat-1.01/crypt.rule)
Input.Mode.....: File (dico.lst)
Hash.Target....: File (crypt.hashes)
Hash.Type......: descrypt, DES(Unix), Traditional DES
Time.Started...: Tue Feb 11 18:59:32 2014 (6 secs)
Time.Estimated.: Fri Feb 21 20:28:58 2014 (10 days, 1 hour)
Speed.GPU.#1...: 18777 H/s
Speed.GPU.#2...: 18781 H/s
Speed.GPU.#3...: 18804 H/s
Speed.GPU.#4...: 18809 H/s
Speed.GPU.#5...: 18768 H/s
Speed.GPU.#6...: 18766 H/s
Speed.GPU.#*...: 112.7 kH/s
Recovered......: 0/1432 (0.00%) Digests, 0/1147 (0.00%) Salts
Progress.......: 60530238764562/158790171105922 (38.12%)
Rejected.......: 60513402828306/60530238764562 (99.97%)
HWMon.GPU.#1...: 99% Util, 50c Temp, -1% Fan
HWMon.GPU.#2...: 99% Util, 59c Temp, -1% Fan
HWMon.GPU.#3...: 99% Util, 55c Temp, -1% Fan
HWMon.GPU.#4...: 99% Util, 58c Temp, -1% Fan
HWMon.GPU.#5...: 99% Util, 56c Temp, -1% Fan
HWMon.GPU.#6...: 99% Util, 59c Temp, -1% Fan

And rules to generate "crypt.rule":

./mp64.bin -1 0 ":" > crypt.rule
./mp64.bin -1 0 "r" >> crypt.rule
./mp64.bin -1 0 "d" >> crypt.rule
./mp64.bin -1 0 "c" >> crypt.rule
./mp64.bin -1 0 "cd" >> crypt.rule
./mp64.bin -1 0 "cr" >> crypt.rule

./mp64.bin -1 0123456789 "^?1'8" >> crypt.rule
./mp64.bin -1 0123456789 "^?1^?1'8" >> crypt.rule
./mp64.bin -1 0123456789 "^?1^?1^?1'8" >> crypt.rule
./mp64.bin -1 0123456789 "^?1^?1^?1^?1'8" >> crypt.rule


Where is my mistake ?


Thx

You have 1147 distinct salts, therefore the speed is divided by 1147 (since each word must be combined w/ those 1147 salts, roughlty speaking).

112.7 kH/s * 1147 = 128.464 MH/s

Descrypt passwords are limited to 8 characters. So the range is from 0 length to 8 length, everything above that length will be rejected.
Therefore you should chose your input files/rules more carefully (especially for descrypt).

Hope this helps

Thx for the calcul, very helpful.

I'm aware about the descrypt specification but there is the same number of rejected password if i add '8 to my rules...

Edit: I find the answer by myself: "The problem is that a word greater than 8 character gets rejected before applying the rules so you cannot use rules to truncate the words to 8 characters"