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A verifiable hierarchical circular shift cipher scheme for P2P chunk exchanges

Peer-to-Peer Networking and Applications volume 8, pages 103–110 (2015)Cite this article

Abstract

BitTorrent swarms rely on reciprocative chunk exchanges among autonomously participating peers. It has been shown that BitTorrent native tit-for-tat mechanism cannot effectively discourage the peer strategic misbehavior such as free-riding and fake chunk attack. This paper proposes a hierarchical chunk cipher scheme based only on bits circular shifting manipulation. As such, encrypted chunks preserve a fraction of information entropy of original chunks that can be observed by the receiving peers directly, which is used for assuring authenticity of the encrypted chunks. Our hierarchical bits shifting scheme allows more flexibility on the fraction of information entropy exposed directly by the encrypted chunks, when compared to the single layer bits shifting scheme. Further, exact mathematical results between the hierarchical scheme and the single layer scheme are derived and analyzed in detail.

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Acknowledgments

This paper is supported by Fostering and Sponsoring Program for Shanghai Young College Teachers (No. egd11009), and SSPU funding (No. QD210004), and Innovation Program of Shanghai Municipal Education Commission (No. 12YZ176).

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Authors and Affiliations

  1. Department of Network Engineering, Shanghai Second Polytechnic University, Room 505,1st Building, JinHai Road 2360, Shanghai, 201209, China

    Jian Wang, Xiaoming Hu, Xiaolin Xu & Yinchun Yang

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  1. Jian Wang
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  2. Xiaoming Hu
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  3. Xiaolin Xu
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  4. Yinchun Yang
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Correspondence to Jian Wang.

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Wang, J., Hu, X., Xu, X. et al. A verifiable hierarchical circular shift cipher scheme for P2P chunk exchanges. Peer-to-Peer Netw. Appl. 8, 103–110 (2015). https://doi.org/10.1007/s12083-013-0225-3

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  • DOI: https://doi.org/10.1007/s12083-013-0225-3

Keywords

  • P2P networks
  • BitTorrent
  • Hierarchial circular shift cipher
  • Verification
  • Free-riding