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Dianzi xuebao

Certified Mail Protocols by Using Signcryption System

Wang Gai-fen

Published Jan 1, 2003• 0 citations
OpenAlex

Abstract

Certified mail protocol is fair exchange of a message M for a receipt.Fairness is the most important property in exchange.We modify existing signcryption system so that it can be used by certified mail protocols,and based on the system we propose new certified mail protocols to guarantee fairness and low computation cost.

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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.
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Signcryption is to perform encryption and signature in a single logical step, and is more efficient than the sign-then-encryption scheme. However, most of the proposed signcryption approaches cannot be used directly by certified e-mail protocol. In this paper, we first develop an id-based signcryption method, which allows a trusted third party to compute a cipher text of a message together with other parties. Then based on the signcryption scheme we propose a new id-based certified e-mail protocol. The fairness, efficiency, and effectiveness of our protocol have been proved.
Fair multi-party certified mail protocol is a value service to deliver important data over internet with guaranteed receipt for each successful delivery.Therefore,the protocol needs to be confidential,and meets non-repudiation,fairness,exclusion and timeliness.This paper pointed out potential security concern for a current protocol,and improved the protocol based on signcryption scheme.The analysis by Kailar logic shows that the protocol can achieve the non-repudiation,fairness.Furthermore,it has advantage of resisting the attacks such as distort,replay and conspiracy.