From: Val Henson <val@nmt.edu>
To: Matt Mackall <mpm@selenic.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>,
James Morris <jmorris@intercode.com.au>,
Jamie Lokier <jamie@shareable.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
davem@redhat.com
Subject: Re: [RFC][PATCH] Make cryptoapi non-optional?
Date: Thu, 14 Aug 2003 10:53:20 -0600 [thread overview]
Message-ID: <20030814165320.GA2839@speare5-1-14> (raw)
In-Reply-To: <20030813040614.GP31810@waste.org>
On Tue, Aug 12, 2003 at 11:06:14PM -0500, Matt Mackall wrote:
> On Tue, Aug 12, 2003 at 11:20:38PM -0400, Theodore Ts'o wrote:
>
> > The real issue is discarding information. By folding, we hide
> > information about the output of the SHA hash that will hopefully deny
> > information that a Very Sophisticated Attacker (say, at the level of a
> > certain agency that designed the SHA algorithm) that might make it
> > easier for them to attack the SHA algorithm.
>
> I'll buy that. However simply dropping the data would serve this
> purpose better. As would hashing less than the entire pool on each
> read.
I agree. Throwing away 80 bits of the 160 bit output is much better
than folding the two halves together. In all the cases we've
discussed where folding might improve matters, throwing away half the
output would be even better.
-VAL
next prev parent reply other threads:[~2003-08-14 16:53 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-09 7:44 Matt Mackall
2003-08-09 8:04 ` David S. Miller
2003-08-09 14:05 ` Matt Mackall
2003-08-09 17:39 ` David S. Miller
2003-08-09 19:46 ` Matt Mackall
2003-08-09 20:17 ` David S. Miller
2003-08-10 8:15 ` Matt Mackall
2003-08-10 8:32 ` virt_to_offset() (Re: [RFC][PATCH] Make cryptoapi non-optional?) YOSHIFUJI Hideaki / 吉藤英明
2003-08-10 8:30 ` David S. Miller
2003-08-10 9:02 ` virt_to_offset() YOSHIFUJI Hideaki / 吉藤英明
2003-08-11 18:21 ` virt_to_offset() David Mosberger
2003-08-12 2:46 ` virt_to_offset() David S. Miller
2003-08-10 9:05 ` virt_to_offset() (Re: [RFC][PATCH] Make cryptoapi non-optional?) Matt Mackall
2003-08-10 9:04 ` David S. Miller
2003-08-10 11:00 ` [PATCH 1/9] introduce virt_to_pagoff() YOSHIFUJI Hideaki / 吉藤英明
2003-08-10 11:00 ` [PATCH 2/9] convert crypto to virt_to_pageoff() YOSHIFUJI Hideaki / 吉藤英明
2003-08-10 11:05 ` [PATCH 3/9] convert net " YOSHIFUJI Hideaki / 吉藤英明
2003-08-10 11:07 ` [PATCH 4/9] convert drivers/block " YOSHIFUJI Hideaki / 吉藤英明
2003-08-10 11:09 ` [PATCH 5/9] convert drivers/ide " YOSHIFUJI Hideaki / 吉藤英明
2003-08-10 11:10 ` [PATCH 6/9] convert drivers/net " YOSHIFUJI Hideaki / 吉藤英明
2003-08-10 11:10 ` [PATCH 7/9] convert drivers/scsi " YOSHIFUJI Hideaki / 吉藤英明
2003-08-10 11:31 ` Christoph Hellwig
2003-08-10 11:51 ` David S. Miller
2003-08-10 12:03 ` YOSHIFUJI Hideaki / 吉藤英明
2003-08-10 14:54 ` Christoph Hellwig
2003-08-10 14:51 ` Christoph Hellwig
2003-08-10 13:54 ` Russell King
2003-08-10 13:55 ` Russell King
2003-08-10 14:55 ` Christoph Hellwig
2003-08-11 5:21 ` David S. Miller
2003-08-10 11:10 ` [PATCH 8/9] convert drivers/usb " YOSHIFUJI Hideaki / 吉藤英明
2003-08-10 11:10 ` [PATCH 9/9] convert fs/jbd " YOSHIFUJI Hideaki / 吉藤英明
2003-08-11 2:15 ` [RFC][PATCH] Make cryptoapi non-optional? Jamie Lokier
2003-08-11 2:38 ` Matt Mackall
2003-08-11 4:54 ` David S. Miller
2003-08-11 5:17 ` Jamie Lokier
2003-08-13 5:01 ` [Numbers][PATCH] " Matt Mackall
2003-08-10 14:46 ` [RFC][PATCH] " James Morris
2003-08-09 14:33 ` Matt Mackall
2003-08-09 17:13 ` Jamie Lokier
2003-08-09 17:33 ` Matt Mackall
2003-08-10 13:18 ` James Morris
2003-08-10 17:45 ` Matt Mackall
2003-08-11 2:09 ` Jamie Lokier
2003-08-11 2:35 ` Matt Mackall
2003-08-11 4:59 ` Jamie Lokier
2003-08-11 5:04 ` Matt Mackall
2003-08-11 5:20 ` Jamie Lokier
2003-08-11 5:54 ` Matt Mackall
2003-08-11 6:24 ` Jamie Lokier
2003-08-11 4:58 ` David Wagner
2003-08-11 5:36 ` Jamie Lokier
2003-08-11 19:21 ` David Wagner
2003-08-13 19:37 ` Jamie Lokier
2003-08-13 3:52 ` Theodore Ts'o
2003-08-13 15:44 ` i810_rng.o on various Dell models Jim Carter
2003-08-13 16:15 ` Jeff Garzik
2003-08-13 18:43 ` Jamie Lokier
2003-08-13 18:36 ` [RFC][PATCH] Make cryptoapi non-optional? Jamie Lokier
2003-08-15 0:16 ` Network Card Entropy? was: " Mike Fedyk
2003-08-15 0:22 ` Robert Love
2003-08-13 3:20 ` Theodore Ts'o
2003-08-13 4:06 ` Matt Mackall
2003-08-14 16:53 ` Val Henson [this message]
2003-08-14 19:40 ` David Wagner
2003-08-14 20:07 ` Chris Friesen
2003-08-14 21:36 ` Jamie Lokier
2003-08-15 0:25 ` Val Henson
2003-08-15 11:47 ` Jamie Lokier
2003-08-15 0:17 ` Val Henson
2003-08-15 1:45 ` David Wagner
2003-08-15 2:21 ` Matt Mackall
2003-08-15 7:30 ` Andries Brouwer
2003-08-15 7:40 ` David S. Miller
2003-08-15 7:55 ` Andries Brouwer
2003-08-15 8:06 ` Måns Rullgård
2003-08-15 8:11 ` Nick Piggin
2003-08-15 15:11 ` Matt Mackall
2003-08-15 22:16 ` Jamie Lokier
2003-08-15 20:22 ` Val Henson
2003-08-16 6:27 ` David Wagner
2003-08-18 4:25 ` Val Henson
2003-08-15 8:09 ` Nick Piggin
2003-08-15 15:03 ` Matt Mackall
2003-08-15 17:04 ` Andries Brouwer
2003-08-15 22:05 ` Jamie Lokier
2003-08-15 22:02 ` Jamie Lokier
2003-08-15 12:48 ` Jamie Lokier
2003-08-15 22:34 ` Theodore Ts'o
2003-08-15 22:12 ` Theodore Ts'o
2003-08-15 23:35 ` James Morris
2003-08-16 15:51 ` Matt Mackall
2003-08-17 14:37 ` James Morris
2003-08-17 15:30 ` Matt Mackall
2003-08-15 23:55 ` Matt Mackall
2003-08-16 0:05 ` Andrew Morton
2003-08-16 0:58 ` Jamie Lokier
2003-08-16 4:57 ` Matt Mackall
2003-08-16 4:38 ` Matt Mackall
2003-08-16 5:03 ` Andrew Morton
2003-08-16 5:39 ` Matt Mackall
2003-08-18 6:43 ` Andreas Dilger
2003-08-18 6:55 ` David Lang
2003-08-18 11:59 ` Jamie Lokier
2003-08-18 12:11 ` Måns Rullgård
2003-08-18 13:33 ` Jamie Lokier
2003-08-18 17:03 ` David Lang
2003-08-18 17:51 ` Jamie Lokier
2003-08-22 4:28 ` David Wagner
2003-08-25 4:29 ` Jamie Lokier
2003-08-18 15:20 ` Matt Mackall
2003-08-18 3:23 ` Theodore Ts'o
2003-08-18 15:46 ` Matt Mackall
2003-08-10 2:07 ` Robert Love
2003-08-10 3:14 ` Matt Mackall
2003-08-10 3:49 ` David S. Miller
2003-08-10 4:01 ` Robert Love
2003-08-10 4:07 ` Robert Love
2003-08-16 20:40 Adam J. Richter
2003-08-17 4:28 ` Matt Mackall
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