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Beijing Youdian Xueyuan xuebao

A New Fair-Exchange Protocol

Qing Zhang, Wen Qiao-yan

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

A new fair exchange protocol with semi-trusted third party is proposed based on a new convertible authenticated encryption scheme.Both security properties and specialties of this protocol are analyzed.The analysis results show that the new protocol has a simpler structure and a lower communication overhead comparing to previous optimistic fair exchange protocols,and the properties of privacy,faireness,non-repudiation and timeliness are satisfied at the same time.

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IEEE International Conference on Data Science in Cyberspace•Jun 1, 2017•2 citations
A new fair exchange protocol with semi-trusted third party is proposed based on a new convertible authenticated encryption scheme.Both security properties and specialties of this protocol are analyzed.The analysis results show that the new protocol has a simpler structure and a lower communication overhead comparing to previous optimistic fair exchange protocols,and the properties of privacy,faireness,non-repudiation and timeliness are satisfied at the same time.
Based on a short signature scheme and discrete logarithm problem,a new fair exchange protocol with the off-line semi-Trusted Third Party(TTP) is proposed.The off-line semi-TTP intervenes into the protocol in case of trouble,which makes the fair exchange optimistic.The off-line TTP need not be completely trusted,since it can get neither signature exchanged when disputation is solved.Because this protocol is based on short signature,which needs low storage and little communication,it can be used in low-bandwidth communication and low-storage environments.
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.
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.
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.
Anonymity attracts wide attention in the electronic transaction, but participants usually do not trust each other. The problem inspires researchers to provide fair exchange protocol based on the third party. However, the third party is fully trusted and vulnerable to attack. This paper proposes an asynchronous optimistic fair exchange protocol. One of the important contributions is to preserve the anonymity even against a semitrusted third party. More importantly, the proposed protocol has minimal dependencies on the semitrusted third party as participants are forced to be honest. Meanwhile, the monopoly information owner can exchange the authentication information with different participants. Security analysis and performance comparison show that our constructions not only ensure transaction privacy and fairness, but also enjoy high efficiency.