hashcat Forum

Hi all,

We built a crackstation. When passing a single NTLM hash to hashcat, I average around 1200 GH/s.  However, when I change the hash to a text file containing two NTLM hashes, the speed drops to around 500 GH/s.  When I change the hash to a text file containing 25,000 NTLM hashes, the speed again drops to 500 GH/s.  This doesn't seem right and I wanted to inquire if anyone has tips or suggestions. 

Thanks!

Nice speed! This is perfectly normal and is due to some of the optimisations that are lost when you go from a single hash to multiple. With a single hash, we can reverse parts of it so most of the time, your GPU(s) don't actually need to perform the full hashing calculations, whereas for 2 or above hashes, Hashcat can't do some of these optimisations, like the one I mentioned, called "Early Skip".

Thank you!