Re: [Cfrg] draft-housley-ccm-mode-00.txt

Carl Ellison <cme@jf.intel.com> Sat, 17 August 2002 12:08 UTC

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Date: Sat, 17 Aug 2002 05:06:28 -0700
To: =?iso-8859-1?Q?G=E9?= Weijers <Ge.Weijers@Sun.COM>
From: Carl Ellison <cme@jf.intel.com>
Subject: Re: [Cfrg] draft-housley-ccm-mode-00.txt
Cc: cfrg@ietf.org
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At 11:48 AM 8/16/2002 -0700, Gé Weijers wrote:
>In an embedded environment where space and power are very
>constrained  (802.11 card) halving the space requirement and
>reducing the amount of  key scheduling that needs to be performed
>can certainly be helpful. Many  current generation 802.11b cards
>lose about 40% throughput when WEP is  enabled. The simpler the
>better.

I can appreciate less-is-better arguments, in some absolute sense,
but I have trouble believing that even a simple card would have
trouble finding another 16 bytes for a second key.  WEP devices
stored 4 keys and had the logic to find the right one to use.

[You might argue that you need multiple keys, WEP-style, but I don't
buy the number 4.  If I need multiple keys for something, then I need
one key (set) per device I'm communicating with, not just a small
number of keys.]

 - Carl

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