Title: User-aided data authentication

Authors: Sven Laur, Sylvain Pasini

Addresses: Department of Computer Science, University of Tartu, Liivi 2, 50409 Tartu, Estonia. ' The Security and Cryptography Laboratory (LASEC), Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland

Abstract: All classical authentication protocols are based on pre-shared authentic information such as long-term secret keys or a public key infrastructure. However, there are many practical settings, where participants can additionally employ authentic Out-Of-Band (OOB) communication, e.g., manual message transfer. In this paper, we study the corresponding user-aided message authentication and key agreement protocols. In particular, we give a unified treatment of many previous results and outline common design principles. We also show that certain properties of user-aided protocols simplify the security analysis in complex environments compared to the standard authentication protocols.

Keywords: message authentication; key agreement; group; universal composability; user-aided protocols; out-of-band communication; OOB communication; security.

DOI: 10.1504/IJSN.2009.023427

International Journal of Security and Networks, 2009 Vol.4 No.1/2, pp.69 - 86

Published online: 23 Feb 2009 *

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