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IET Conference on Wireless, Mobile and Sensor Networks (CCWMSN)

An improved certified e-mail protocol for mobile environments

Xun Sun, Jianhua Li, Yang Shu-tang, Gongliang Chen

Published Jan 1, 2007• 0 citations

Abstract

As e-mail services get wide use in business transactions, the privacy and fairness properties of these services become more important. A certified e-mail protocol focuses mainly on the fairness of e-mail exchanges: it ensures that the receiver get access to the e-mail content if and only if the sender obtains a non-refutable proof of receipt, which is usually a signature of the receiver. This paper identifies a security flaw in a certified e-mail protocol for mobile environments based on the Guillou-Quisquater signature scheme, proposed at GLOBECOM 2003. A dishonest sender can exploit this flaw to gain advantage over the message receiver with high probability within a few rounds of interactions. We then propose an improved protocol, which is based on a verifiably encrypted RSA signature scheme, to fix this security flaw. The new protocol obtains a trustable security (fairness) level and is as efficient as the original insecure protocol.

DOI: 10.1049/cp:20070274

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A certified e-mail protocol is about fair exchange of a message m for its receipt. Fairness is the most important property in exchange. We modify existing W-B signcryption scheme so that it can be used by certified e-mail protocols,and based on the modified scheme we propose a new certified e-mail protocol. The protocol makes use of an off-line and transparent trusted third party only in exceptional circumstances,and has lower computation overhead and better efficiency comparing related protocol.

Electronic mail delivery is one of the most important and desirable services, by which the intended recipient will get the mail if and only if the mail originator receives a valid and irrefutable proof of the receipt. The idea of conditional trusted third party has been developed on the basis of semi-trusted TTP and a suite of acceptable conditions is given. A new practical protocol for certified e-mail is presented, which can guarantee acceptable fair with interception of conditional TTP. More, the evidence in the new protocol is publicly verifiable without any restrictions on the type of signature and encryption algorithms.

Abstract:- An efficient and secure protocol in certified e-mail delivery is proposed in this paper. With the widespread use of public Internet, communication via electronic mail (e-mail) becomes a convenience application instead of traditional manuscript letter. People can easily append his/her digital signature to the e-mail in order to achieve the goal of non-repudiation of origin. However, the evidence of receipt still relies on the willingness of the recipient in the standard e-mail service. Hence, the recipient has no responsible for the received e-mail. In this paper, we present an efficient and secure protocol in fair certified e-mail delivery (CEMD). Our protocol efficiently provides non-repudiation of origin and receipt in the fair manner. In other words, the sender can obtain the irrefutable receipt if and only if the recipient gets the certified e-mail from the sender, otherwise, neither of them. Moreover, the proposed CEMD is efficiently in sending the other mails to the same recipient by using the pre-computation function. As the evaluations of computational cost and communication overhead, our protocol is cost-effective and efficient than other relevant protocols.