john-users - Most efficient way to brute force

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Date: Mon, 26 Nov 2018 20:21:58 -0500
From: Powen Cheng <madtomic@...il.com>
To: john-users@...ts.openwall.com
Subject: Most efficient way to brute force

Hello,

This is the test setup that I am stuck with so I want to make sure that
these two commands are the most efficient way to brute force with 8 threads
per video card.

As per magnumripper, using two separate terminals.

OMP_NUM_THREADS=8 ./john -dev=0 -node=1/2 -form=tezos-opencl
-ses=tezos1 tezos -inc

OMP_NUM_THREADS=8 ./john -dev=1 -node=2/2 -form=tezos-opencl
-ses=tezos2 tezos -inc

I was told to use --incremental and I read that I could also create and use
my own custom Incremental.

[Incremental:Custom]
File = custom.chr
CharCount = 95
MinLen = 6
MaxLen = 8

So to use my own custom incremental. I would simply add -inc:custom -
is this correct?

OMP_NUM_THREADS=8 ./john -dev=0 -node=1/2 -form=tezos-opencl
-ses=tezos1 tezos -inc:custom

OMP_NUM_THREADS=8 ./john -dev=1 -node=2/2 -form=tezos-opencl
-ses=tezos2 tezos -inc:custom

Other related questions.

Since the MinLen starts at 6. I am guessing that it would start with
000000 up to charset?
Then when Length of 6 is done, it would move to 7 or 0000000, etc.

Please help me understand how incremental work with John.

I want to make sure that I using this brute force as efficient as possible.

Thanks,
Po

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