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Message-ID: <ea42dff4-d49c-4ba3-b3cb-6465a72a2341@gmail.com>
Date: Sat, 8 Nov 2025 19:11:41 +0100
From: Albert Veli <albert.veli@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: 2 questions about cracking 233 million NTLM
passwords
Hi!
On 2025-11-08 16:10, jeff wrote:
> I am cracking a lot of NTLM passwords.
> I am using a windows 11 machine with 64 cores and 256gb of ram.
> I am using a version of john compiled in 2025,
> john_jumbo_2025_winX64_1_JtR.7z
>
> I am using the --fork option. I am currently running 14 threads, due
> to limited memory.
> Each fork process uses about 16gb of ram.
> Is there any way to reduce the memory usage, so I can run more threads?
I have no experience with your hardware but it would be interesting to
see some benchmarks. Try some different options, --format NT-long,
NT-opencl, ntlmv2-opencl, netntlmv2, netntlm, netntlm-naive, NT, LM,
NT-long-opencl. I don't know which ones are correct, you'll notice if
each format cracks anything or not. Once you got the correct formats,
start benchmarking all formats that work.
Btw, don't combine the opencl-formats and the --fork option. Only use
--fork on the non-opencl formats.
And after that it's time to start to analyze why some formats are faster
than others.
Best regards,
Albert
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