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Re: ESP with stream ciphers

To: Rodney Thayer <rodney@sabletech.com>
Subject: Re: ESP with stream ciphers
From: Stephen Kent <kent@bbn.com>
Date: Tue, 15 Apr 1997 16:30:19 -0400
Cc: ipsec@tis.com
In-Reply-To: <3.0.1.32.19970415084450.00df7c0c@pop3.pn.com>
References: <v03007806af786ab5d06a@[128.89.0.110]><97Apr14.161245edt.11650@janus.border.com>
Sender: owner-ipsec@ex.tis.com

Rodney,

	As I mentioned in an earlier message to Norm, the size of the IV
depends on the algorithm and mode.  The DES specs (in terms of FIPS) call
for 4 or 8 bytes IVs, depending on the mode.  Some proposals for ESP
transforms have implicit IVs (generated from other packet info), while
others have also allowed for 4 or 8 byte ecplicit IVs.

	As for stream ciphers for which an offset is employed for crypto
synch, the offset value size will vary depending on the algorithm.  But, at
least the size of these values is fixed as part of the SA negotiation
process and not variable.

Steve

References:

Re: ESP with stream ciphers

From: Stephen Kent <kent@bbn.com>

ESP with stream ciphers

From: Norman Shulman <norm@border.com>

Re: ESP with stream ciphers

From: Rodney Thayer <rodney@sabletech.com>

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