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Computer Engineering and Applications Journal

A New Multi-party Non-repudiation Protocol without TTP

Pla Information

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

By analyzing the reference [1],we found some secure hidden dangers in key-base.Because of the deal lack of tags,customers can be cheated when some deals carried on contemporaneously.According to reference[2],we construct a new multi-party non-repudiation protocol using signcrypytion without TTP and analyse its security.Our scheme has higher security and efficiency than reference [1].

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By analyzing the reference [1],we found some secure hidden dangers in key-base.Because of the deal lack of tags,customers can be cheated when some deals carried on contemporaneously.According to reference[2],we construct a new multi-party non-repudiation protocol using signcrypytion without TTP and analyse its security.Our scheme has higher security and efficiency than reference [1].
Based on the hardness assumption of discrete logarithm problem and a group oriented encryption scheme, a new multi-party non-repudiation protocol is presented. The features of this protocol are the following: In the B2C or B2B e-commerce application,it is necessary for an organisations/people to deal with all kinds of requests, business documents, agreements, payments, contracts, acknowledgments as a batch.The protocol allows such organisations/people to send different messages to multiple different recipients, eliminates the previous restriction on the exchange of the same message. The protocol also utilizes an off-line third trusted party (TTP for short) and has higher efficiency than those protocols with an on-line TTP.
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.
The previous multi-party non-repudiation protocols normally focus on one round message exchange.The multi-round message exchanges within the same participatores are not studied well.For the latter condition,we presented a multi-party non-repudiation protocol using key chains which can reduce the TTP's storage requirements.The protocol consists of a dispute resolution policy and four sub-protocols,i.e.,the initialization sub-protocol,the exchange sub-protocol,the abort sub-protocol and the recovery sub-protocol.Technical discussions show that the protocol satisfies fairness,timeliness and confidentiality.
With the development of e-commence and other utilities on internet,a new security service——fair non-repudiation becomes more important and crucial.But,most current protocols depend on trusted third party(TTP),so a fair non-repudiation protocol without TTP is needed.But the existing fair protocols don't have equal security for message originator and receiver,and they can not assure the security of the message originator.In this paper,a new protocol is designed for the prior security of the originator,and a fair non-repudiation protocol without TTP based on entity's computing power is proposed to get rid of the dependence on TTP,to solve the security problems that exist when message originator and receiver's computing power are not equal.
We survey the state of non-repudiation cryptographic protocols, almost all of which have weaknesses. The paper proposes a perfect protocol which can be used to realize the strong fairness and non-repudiation of both parties even if the channels are not reliable. Usually the protocol only needs three interactions of participants and the transferring data remain confidential for others but the sender and the receiver, who are unknown to others. The Trusted Third Party(TTP) acts as a notary rather than a delivery and its bottleneck problem is solved completely. Finally the security of the protocol is analysed in detail.