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DT-CP: a double-TTPs based contract-signing protocol with lower computational cost

DT-CP: a double-TTPs based contract-signing protocol with lower computational cost

Xu, Guangquan, Zhang, Yao, Jiao, Litao, Panaousis, Emmanouil ORCID: 0000-0001-7306-4062, Liang, Kaitai, Wang, Hao and Li, Xiaotong (2019) DT-CP: a double-TTPs based contract-signing protocol with lower computational cost. IEEE Access, 7. pp. 174740-174749. ISSN 2169-3536 (Online) (doi:

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This paper characterizes a contract signing protocol with high efficiency in Internet of Things. Recent studies show that existing contract-signing protocols can achieve abuse-freeness and resist inference attack, but cannot meet the high-efficiency and convenience requirement of the future Internet of things applications. To solve this problem, we propose a novel contract-signing protocol. Our proposed protocol includes two main parts: 1) we use the partial public key of the sender, instead of the zero-knowledge protocol, to verify the intermediate result; 2) we employ two independent Trusted Third Parties (TTPs) to prevent the honest-but-curious TTP. Our analysis shows that our double TTP protocol can not only result in lower computational cost, but also can achieve abuse-freeness with trapdoor commitment scheme. In a word, our proposed scheme performs better than the state of the art in terms of four metrics: encryption time, number of exponentiations, data to be exchanged and exchange steps in one round contract-signing.

Item Type: Article
Uncontrolled Keywords: contract-signing protocol, abuse-freeness, double trusted third parties, trapdoor commitment scheme
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Faculty / School / Research Centre / Research Group: Faculty of Engineering & Science > Internet of Things and Security Research Centre (ISEC)
Faculty of Engineering & Science > School of Computing & Mathematical Sciences (CMS)
Faculty of Engineering & Science
Last Modified: 04 Mar 2022 13:06

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