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Re: pre-shared key v RSA encryption or RSA signature authentication modes

To: "Prof. Ahmed A. A. Adas" <alaadas@kaau.edu.sa>
Subject: Re: pre-shared key v RSA encryption or RSA signature authentication modes
From: Uri Blumenthal <uri@lucent.com>
Date: Thu, 21 Mar 2002 11:07:49 -0500
Cc: cdemar@ebsdr.com, ipsec@lists.tislabs.com
Organization: Lucent Technologies
Original-CC: cdemar@ebsdr.com, ipsec@lists.tislabs.com
References: <TFSFRNDS@ebsdr.com> <000701c1d0d9$cf43eb20$4969fea9@amanda2>
Sender: owner-ipsec@lists.tislabs.com

"Prof. Ahmed A. A. Adas" wrote:
> As a researcher in cryptosystems and protocols, I would say that RSA-sig IKE
> is much more powerful unless someone is using quantum computing attacks,
> which are not feasible in the near future.

It is comparing apples with oranges.  The conclusion appears
incorrect,
and way too generalizing [without due justification].

Please explain - based on what is, say 2048-bit RSA-sig stronger than,
say 256-bit key-based AES-XCBC-MAC signature? What is your criteria?
What attacks are you considering? What is your model?
--
Regards,
Uri
-=-=-=<>=-=-
<Disclaimer>

Follow-Ups:
- Re: pre-shared key v RSA encryption or RSA signature authentication modes
  - From: Derek Atkins <warlord@mit.edu>

References:
- pre-shared key v RSA encryption or RSA signature authentication modes
  - From: cdemar@ebsdr.com
- Re: pre-shared key v RSA encryption or RSA signature authentication modes
  - From: "Prof. Ahmed A. A. Adas" <alaadas@kaau.edu.sa>

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