A distributed trust evaluation protocol with privacy protection for intercloud

Yi Dou, Henry C.B. Chan, Man Ho Au

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


Intercloud seeks to facilitate resource sharing among clouds. To support Intercloud, a trust evaluation framework among clouds and users is required. For trust evaluation, conventional protocols are typically based on a centralized architecture focusing on a one-way relationship. For Intercloud, the environment is highly dynamic and distributed, and relationships can be one-way or two-way (i.e., clouds provide services to each other). This paper presents a distributed trust evaluation protocol with privacy protection for Intercloud. The new contributions and innovative features are summarized below. First, feedback is protected by homomorphic encryption with verifiable secret sharing. Second, to cater to the dynamic nature of Intercloud, trust evaluation can be conducted in a distributed manner and is functional even when some of the parties are offline. Third, to facilitate customized trust evaluation, an innovative mechanism is used to store feedback, such that it can be processed flexibly while protecting feedback privacy. The protocol has been proved based on a formal security model. Simulations have been performed to demonstrate the effectiveness of the protocol. The results show that even when half of the clouds are malicious or offline, by choosing suitable operational parameters the protocol can still support effective trust evaluation with privacy protection.

Original languageEnglish
Article number8543602
Pages (from-to)1208-1221
Number of pages14
JournalIEEE Transactions on Parallel and Distributed Systems
Issue number6
Publication statusPublished - 1 Jun 2019


  • cloud computing
  • Intercloud
  • privacy
  • reputation
  • trust evaluation

ASJC Scopus subject areas

  • Signal Processing
  • Hardware and Architecture
  • Computational Theory and Mathematics

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