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Date: Wed, 16 Nov 2005 13:01:45 +0300
From: Solar Designer <>
Subject: Re: Speed up John

On Wed, Nov 16, 2005 at 10:26:17AM +0100, Michael Behrisch wrote:
> Am Mittwoch, 16. November 2005 10:09 schrieb Solar Designer:
> > "john --stdout" would require more bandwidth and would not scale too
> > well, though, -- but it's fine for the slower hashes and for not too
> > many nodes.
> No, my idea was to use john --stdout on the client side. The setup would be 
> as follows. The client connects to the server and says "ready to crack".
> The server says OK, please take password 1000 to 2000, the client runs
> john --stdout, throws away the first 1000

What if it would need to throw away the first billion of candidates
once those have already been tried?

> and feeds the next 1000 into
> john --stdin and then responds OK to the server which gives the next 
> share and so forth. The server needs to know nothing about john, it just gives
> the numbers which is very low bandwidth. This would also scale easily.

It really won't work well.

Approaches like that do require messing with John internals (for purists:
"john.rec" files fall into the same category, but a source code patch
works much better).

Alexander Peslyak <solar at>
GPG key ID: B35D3598  fp: 6429 0D7E F130 C13E C929  6447 73C3 A290 B35D 3598 - bringing security into open computing environments

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