International Journal of Theoretical Physics

, Volume 58, Issue 11, pp 3677–3683 | Cite as

Fair and Optimistic Contract Signing Based on Quantum Cryptography

  • Xiao-Qiu Cai
  • Xiao-Xuan Wang
  • Tian-Yin WangEmail author


Contract signing is an important cryptographic primitive and has many applications in e-commerce. Over last few years, quantum contract signing has attracted much attention because its security is based on the fundamental principles of quantum mechanics. In this paper, a new fair and optimistic contract signing protocol based on quantum cryptography is proposed. Compared with the prior work, this protocol no longer needs to sign the exchanged messages containing the contract, the identifier number of qubits’ sequence and so on, and therefore it does not depend on the current signing technology any longer. Furthermore, the communication complexity is reduced due to removing the exchange of the signatures between two clients.


Contract signing E-commerce Quantum cryptography 



This work was supported by the National Natural Science Foundation of China (Grant Nos. 61602232, 61572246), the Program for Science & Technology Innovation Research Team in Universities of Henan Province (Grant No. 18IRTSTHN014), the Plan for Scientific Innovation Talents of Henan Province (Grant No. 184200510011), Inter-governmental International Scientific and Technological Innovation Cooperation Key Project (Grant No. 2016YFE0104600) and the Key Scientific and Technological Research Project of Henan Province (Grant No. 182102310930).


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Mathematical ScienceLuoyang Normal UniversityLuoyangChina

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