Speed difference between brute and dictionary for very slow hashes (7-zip) ?

[marpolo]

Hi!

Thank you! You give me an excellent tip!

Yes 7-zip hash calculation speed is lower for password with higher length.
I measured such numbers on my GTX750:

Code:

Passwords with 4 letters - 1480 H/s
Passwords with 5 letters - 1300 H/s
Passwords with 6 letters - 1190 H/s
Passwords with 7 letters - 1120 H/s
Passwords with 8 letters - 1060 H/s
Passwords with 9 letters - 940 H/s
Passwords with 10 letters - 880 H/s
...
Passwords with 29 letters - 435 H/s
...

In above example wordlist contains only words with the same length.

But if wordlist contains words with different length hashcat will have significant speed drop!

For wordlist pattern like this:

Code:

a
aa
...
aaaaaaaaaaaaaaaaaaaa (20)
a
aa
...
aaaaaaaaaaaaaaaaaaaa (20)

Speed is only 206 H/s.

So wordlist sorted by password length has around x2-5 speedup as opposed to wordlist sorted by alphabetical order!



Thanks a lot!