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Dianzi Ke-ji Daxue xuebao

A Sec-Email Protocol Based on the Convertible Authenticated Encryption Scheme

Zhongxian Li

Published Jan 1, 2010• 1 citation
OpenAlex

Abstract

On deep research on the workflow of non-repudiation and fair-exchange protocols in electronic commerce,it is proved that these protocols with trusted third party need to run in four steps at least. The analysis of an existing protocol shows that it needs to run in four steps,rather than just run in three steps it claims. On the principle that security protocol and cryptography system should be designed separately,a common model of convertible authenticated encryption schemes is proposed by analyzing some existing convertible authenticated encryption schemes. By using this model,a secure email protocol with semi-trusted third party is designed. Result shows that this protocol has non-repudiation features of both sender and receiver by formal analysis.

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On deep research on the workflow of non-repudiation and fair-exchange protocols in electronic commerce,it is proved that these protocols with trusted third party need to run in four steps at least. The analysis of an existing protocol shows that it needs to run in four steps,rather than just run in three steps it claims. On the principle that security protocol and cryptography system should be designed separately,a common model of convertible authenticated encryption schemes is proposed by analyzing some existing convertible authenticated encryption schemes. By using this model,a secure email protocol with semi-trusted third party is designed. Result shows that this protocol has non-repudiation features of both sender and receiver by formal analysis.
Non-repudiation service is crucial to electronic commerce. Now multi-party non-repudiation is a new focus of research. This paper presents a multi-party non-repudiation protocol, based on a group encryption scheme. A multi-party non-repudiation problem is defined in this paper. This definition and the resulting protocol are more general than the other comparable work. At last, an example of fair multi-party non-repudiation protocol without a trusted third party (TTP) is given out, which uses formal method of SVO logic to analyze the protocol and prove its correctness.
A non-repudiation cryptographic protocol based on hybrid cryptosystem is proposed and it is a more perfect protocol.It can realize the true fairness and non-repudiation of both parties even the channels are unreliable and insecure.Usually the protocol only needs three interactions of participants and the transferring data keep confidential for others except for the sender and the receiver,whose transactions are protected.The Trusted Third Party(TTP) performs evidences verification,generation and publication and its bottleneck problem is solved completely.Finally,we give its formal analysis and prove the protocol's fairness,correctness and security.
Non-repudiation service is the foundation of security on which important data and sensitive news are conveyed on the Internet in e-commerce. Non-repudiation protocol is a special network protocol which provides non-repudiation service. Because of the importance of non-repudiation to electronic commerce activities and the fact that non-repudiation protocol is relatively few, this paper adopts the modern cryptographic algorithms and techniques and designs a mutually undeniable cryptographic protocol. Analyses show that the improved protocol avoids the trusted third party being the bottleneck problem, and also realizes the confidentiality of transferring data, and the fairness and non-repudiation of the sender and the receiver.
Non-repudiation is one of the most important premises to achieve electronic commerce while fairness is what people have been chasing during electronic transaction. Fair non-repudiation protocols resolve the question of non-repudiation during the course of transferring information in electronic commerce and make all communicating sides in equal positions. That is to say, the protocols are fair for all sides. In the present paper, a fair multi-party non-repudiation protocol based on a group encryption scheme is introduced. The flow of the protocol and its analysis are given in the paper. In the protocol, every side can not have advantages over other sides, because the advantages can result in great loss of other sides. The method that how to solve the dissension with this protocol is also given in the present paper. A trusted third party is used to generate non-repudiation evidence. With this method the number of exchanged messages is small. So this protocol can achieve non-repudiation service in an efficient and practical way.