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A Fair and Efficient Secret Sharing Scheme Based on Cloud Assisting

  • Mingwu ZhangEmail author
  • Xiao Chen
  • Gang Shen
  • Yong Ding
Conference paper
  • 590 Downloads
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11806)

Abstract

In threshold secret sharing schemes, the secret s is divided into n shares by a dealer, such that learning t or more than t shares can reconstruct this secret, but knowing fewer than t shares cannot reveal any information about the secret s. In order to enhance the confidentiality of shares, reduce the participants’ computational costs, and guarantee the fairness of secret reconstruction, this paper proposes a fair and efficient secret sharing scheme based on cloud assisting. Specifically, we represent the computational process of Shamir’s scheme as a matrix operation and encrypt the shares by using a random one-dimensional matrix for guaranteeing the confidentially of shares. In addition, we employ cloud computation platform that assists to reduce the redundancy of reconstruction computation and participants’ computational costs. To ensure the fairness of secret reconstruction, our scheme enables participants to recover their secret without revealing their share to the other participants, and ensure that only when all participants are honest, they can reveal the correct secret. The performance analysis demonstrates that the proposed scheme achieves a stronger level of security and a lower computational cost. We also provide the experimental results and show that the proposed approach is feasible and efficient compared with related works.

Keywords

Secret sharing Fairness Unconditional security Matrix operations 

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Mingwu Zhang
    • 1
    • 2
    Email author
  • Xiao Chen
    • 1
  • Gang Shen
    • 1
  • Yong Ding
    • 2
  1. 1.School of Computer ScienceHubei University of TechnologyWuhanChina
  2. 2.School of Computer Science and Information SecurityGuilin University of Electronic TechnologyGuilinChina

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