john-users - Re: wordlist mode improvment maybe

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Date: Sun, 27 Jan 2008 05:23:56 +0200
From: "Marti Raudsepp" <marti@...fo.org>
To: john-users@...ts.openwall.com
Subject: Re: wordlist mode improvment maybe

On 1/26/08, helleye <jameskond@...mail.com> wrote:
> you think it will improve speed ?

Probably not, because cracking speed is usually CPU-bound (not I/O
bound). Doing runtime decompression would increase CPU usage rather
than reduce it.
Wordlist files aren't typically larger than tens of megabytes. For
comparison, modern 7200RPM hard disks can easily do over 50 MB/s for
sequential reads.

However if there really is a good reason, you could pull this off
using widely available compression tools like gzip/bzip2/lzma by
piping their output to john's stdin. They would probably also have
much better compression ratios (>5 times is normal for text files).

Marti

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