Cryptology ePrint Archive: Report 2003/256

On the Security of a Multi-Party Certified Email Protocol

Jianying Zhou

Abstract: As a value-added service to deliver important data over the Internet with guaranteed receipt for each successful delivery, certified email has been discussed for years and a number of research papers appeared in the literature. But most of them deal with the two-party scenarios, i.e., there are only one sender and one recipient. In some applications, however, the same certified message may need to be sent to a set of recipients. In ISC'02, Ferrer-Gomila et. al. presented a multi-party certified email protocol~\cite{FPH02}. It has two major features. A sender could notify multiple recipients of the same information while only those recipients who acknowledged are able to get the information. In addition, its exchange protocol is optimized, which has only three steps. In this paper, we demonstrate some flaws and weaknesses in that protocol, and propose an improved version which is robust against the identified attacks while preserving the features of the original protocol.

Category / Keywords: applications / certified email, non-repudiation, security protocol

Date: received 12 Dec 2003, last revised 11 Feb 2004, withdrawn 11 Aug 2004

Contact author: jyzhou at i2r a-star edu sg

Available format(s): (-- withdrawn --)

Version: 20040811:130501 (All versions of this report)

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