Efficient real-time auditing and proof of violation for cloud storage systems

Gwan Hwan Hwang, Hung Fu Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)


In this paper we study how to develop an efficient real-time auditing and proof of violation (POV) scheme for cloud storage systems. A POV scheme enables a user or a service provider to produce cryptographic proofs which can be used to prove either the occurrence of the violation of properties or the innocence of the service provider. POV schemes are solutions for obtaining mutual nonrepudiation between users and the service provider in the cloud. After each file operation, a realtime auditing should be performed so that the violation of the service provider can be found instantly. Existing solutions need to cache the hash values of files in client devices and thus the overhead for storing and synchronizing hash values in client devices which share files is huge. We propose a novel scheme in which client devices do not need to cache any hash values of files. A small portion called slice of a binary hash tree is transferred to the client device for real-time auditing and it can support POV whenever the audit does not pass. Experimental results are presented that demonstrate the feasibility of the proposed scheme and show that our scheme outperforms previous work by one to two order of magnitude. Service providers of cloud storage can use the proposed scheme to provide a mutual nonrepudiation guarantee in their service-level agreements.

Original languageEnglish
Title of host publicationProceedings - 2016 IEEE 9th International Conference on Cloud Computing, CLOUD 2016
EditorsIan Foster, Nimish Radia, Ian Foster
PublisherIEEE Computer Society
Number of pages8
ISBN (Electronic)9781509026197
Publication statusPublished - 2017 Jan 17
Event9th International Conference on Cloud Computing, CLOUD 2016 - San Francisco, United States
Duration: 2016 Jun 272016 Jul 2

Publication series

NameIEEE International Conference on Cloud Computing, CLOUD
ISSN (Print)2159-6182
ISSN (Electronic)2159-6190


Other9th International Conference on Cloud Computing, CLOUD 2016
Country/TerritoryUnited States
CitySan Francisco


  • Cloud security
  • Cloud storage
  • Nonrepudiation
  • Proof of violation
  • Real-time auditing
  • Service-level agreement

ASJC Scopus subject areas

  • Artificial Intelligence
  • Information Systems
  • Software

Cite this