I think the following describe MAC very well:
Data associated with an authenticated message that allows a receiver to
verify the integrity of the message. (Glossary of INFOSEC and INFOSEC
Related Terms - Idaho State University).
www.hipaabasics.com/glossary.htm
A Message Authentication Code is a one-way hash computed from a message and
some secret data. It is difficult to forge without knowing the secret data.
Its purpose is to detect if the message has been altered.
www.zvon.org/tmRFC/RFC2246/Output/chapter12.html
in a payment system, a code used to validate the source of integrity of the
message.
www.gbc.hu/english/bszotare3.htm
In cryptography, a message authentication code (MAC) is a short piece of
information used to authenticate a message. A MAC algorithm (sometimes
termed a keyed hash function) accepts as input a secret key as well as the
message, and produces a MAC (sometimes known as a tag). The MAC protects
both a message's integrity—by ensuring that a different MAC will be produced
if the message has changed—as well as its authenticity—because only someone
who knows the secret key could have
en.wikipedia.org/wiki/Message_authentication_code
Best regards
Clement
-----Original Message-----
From: CISSP-Discuss@yahoogroups.com [mailto:CISSP-Discuss@yahoogroups.com]
On Behalf Of Manish Bajaj
Sent: Monday, May 09, 2005 11:45 AM
To: Roshan Mani
Cc: Vijay Kumar; CISSP-Discuss@yahoogroups.com
Subject: Re: [CISSP-D] Symmetric Key and authentication.
You can achieve non-repudiation only thru Asymmetric encryption. It is
so because only PKI provides you with a private key that only you are
supposed to have. It is not shared with any other entity and nobody
can claim to have send a message on your behalf... which is the crux
of non repudiation.
If authenticaton is the only issue, then you have can work with either.
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