Re: What does the MAC in IES or ECIES achieve ?

From: "Tom St Denis" <tomstdenis@xxxxxxxxx>
Date: 30 Oct 2006 12:12:52 -0800

fabrice.gaut...@xxxxxxxxx wrote:

Hi,

What does the addition of a MAC achieve for IES/ECIES ?

IIRC IES is just DH with a MAC strapped on. The goal is to ensure both
the privacy and integrity of the message are in tact.

It doesn't give you nonrepudiation qualities since the authenticity is
anonymous.

Tom

.

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