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Dianzi xuebao

A New Fair Non-Repudiation Protocol with Off-Line Semi-Trusted Third Party

Cai Wang

Published Jan 1, 2002• 0 citations
OpenAlex

Abstract

Non repudiation and fairness turn out to be two important security properties of electronic commerce protocols.In this paper,based on a verifiable encryption with blind decryption,we present a new fair non repudiation protocol with off line semi trusted third party,so either transaction party can unilaterally bring a transaction to completion without losing fairness.This is the first non repudiation protocol with off line semi trusted third party.

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Non repudiation and fairness turn out to be two important security properties of electronic commerce protocols.In this paper,based on a verifiable encryption with blind decryption,we present a new fair non repudiation protocol with off line semi trusted third party,so either transaction party can unilaterally bring a transaction to completion without losing fairness.This is the first non repudiation protocol with off line semi trusted third party.
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.
The difference between the fair exchange protocols and the non-repudiation protocols is proposed. Based on the publicly verifiable secret sharing scheme and group encryption scheme, a new multi-party fair exchagne protocol with an off-line semi-Trusted Third Party(off-STTP) is presented. The off-STTP who need not be completely trusted intervenes into the exchange in case of trouble. That the off-STTP can only decipher a sub-secret key makes sure the confidentiality of exchange data and the true fairness of the barter. The participants can barter with others at their will and the exchange topology is unknown to others including the off-STTP.
The techniques of verifiable secret sharing and verifiable encryption are used in the construction of two party fair exchange protocols.The novelty of the construction lies in the introduction of the distributed semi-trusted third party.Compared to the previous fair exchange protocols with a single semi-trusted third party,the newly constructed fair exchange protocol can further guarantee the security and fairness of the transaction due to the existence of the distributed semi-trusted third party.