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Re: Generic CBC-MAC specification

To: ipsec@tis.com
Subject: Re: Generic CBC-MAC specification
From: FUKUMOTO Atsushi <fukumoto@isl.rdc.toshiba.co.jp>
Date: Thu, 12 Feb 1998 17:59:36 +0900
In-reply-to: ben's message of "Tue, 10 Feb 1998 21:40:38 EST." <199802110240.VAA06780@carp.morningstar.com>
Sender: owner-ipsec@ex.tis.com

Only description I could find about CBC-MAC in "Applied Cryptography
2nd ed." (first print) is in p.456, where it says:

	[...] encrypt a message with a block algorithm in CBC or CFB
	modes.  The hash is the last encrypted block, encrypted once
	more in CBC or CFB modes.

This last line, "encrypted once more in CBC or CFB modes", seems to be
different from FIPS81 Appendix F, or Mr.Rogers' CBC-MAC draft.

So my question is, am I right that the description of Applied
Cryptography is wrong, and the "encrypted once more" should only be
applied to CFB mode?


					FUKUMOTO Atsushi
					fukumoto@isl.rdc.toshiba.co.jp

Follow-Ups:

Re: Generic CBC-MAC specification

From: "Theodore Y. Ts'o" <tytso@MIT.EDU>

References:

Generic CBC-MAC specification

From: Ben Rogers <ben@Ascend.COM>

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