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Re: Sequence Number

To: William Allen Simpson <wsimpson@greendragon.com>
Subject: Re: Sequence Number
From: Norman Shulman <norm@tor.securecomputing.com>
Date: Fri, 11 Jul 1997 11:57:29 -0400
cc: ipsec@tis.com
In-Reply-To: <6238.wsimpson@greendragon.com>
Sender: owner-ipsec@ex.tis.com

On Fri, 11 Jul 1997, William Allen Simpson wrote:

>    The Sequence Number is a 32-bit (4 byte) unsigned counter.  This
>    field protects against replay attacks, and may also be used for syn-
>    chronization by stream or block-chaining ciphers.

Synchronizing stream ciphers requires a stream offset; synchronizing a
block-chaining cipher requires an IV.

Norm


                    Norman Shulman      Secure Computing Canada
     	         Systems Developer      Tel 1 416 813 2075
      norm@tor.securecomputing.com      Fax 1 416 813 2001

References:

Sequence Number

From: "William Allen Simpson" <wsimpson@greendragon.com>

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