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Date: Thu, 22 Dec 2011 23:31:14 +0530
From: piyush mittal <piyush.cse29@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: Bit slice implementation of DES based hashes
>
> Given this understanding, do you see why your piece of code where you
> were putting entire octets from plain_salt_mix[] into elements of B[]
> was obviously wrong?
>
Yes that was totally wrong.because today only I have read the paper.
Also, do you understand why the get_hash() functions process a few
> initial elements of B[] only?
>
No this I am not getting.Why here only B[0] have taken?Is here just 1st bit
of each hash is checking?? and Does DEPTH here represents total number of
words present??
On Thu, Dec 22, 2011 at 11:07 PM, Solar Designer <solar@...nwall.com> wrote:
> On Thu, Dec 22, 2011 at 10:50:20PM +0530, piyush mittal wrote:
> > According to the paper what I understood is as follows but it can be
> wrong
> > as well..
> >
> > 0th bit of block will go to the 0th bit of word.
> > 0th bit of key will go to 0th bit of word.
> > 11th bit of block will go to the 0th bit of 11th word
> > 11th bit of key will go to the 0th bit of 11th word.
> ...
> > 0th bit of 2nd block will go to the 2nd bit of first word
> > 0th bit of 2nd key will go to the 2nd bit of first word.
> > 11th bit of 2nd block will go to the 2nd bit of 11th word
> > 11th bit of 2nd key will go to the 2nd bit of 11th word
>
> OK, this is mostly right (except for the minor issue with 0-based vs.
> 1-based numbering in these examples).
>
> Given this understanding, do you see why your piece of code where you
> were putting entire octets from plain_salt_mix[] into elements of B[]
> was obviously wrong?
>
> Also, do you understand why the get_hash() functions process a few
> initial elements of B[] only?
>
> Alexander
>
--
Piyush Mittal
Department of Computer Science and Engineering
National Institute of Technology,Rourkela
INDIA
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