Journal on Communications ›› 2020, Vol. 41 ›› Issue (6): 98-111.doi: 10.11959/j.issn.1000-436x.2020103

• Papers • Previous Articles     Next Articles

Threshold re-encryption based secure deduplication method for cloud data with resistance against side channel attack

Xin TANG1,Linna ZHOU2,Weijie SHAN1,Dan LIU1   

  1. 1 School of Information Science and Technology,University of International Relations,Beijing 100091,China
    2 School of Cyberspace Security,Beijing University of Posts and Telecommunications,Beijing 100084,China
  • Revised:2020-03-23 Online:2020-06-25 Published:2020-07-04
  • Supported by:
    Special Funded by Construction of Advanced Disciplines for University of International Relations(2019GA36);The National Natural Science Foundation of China(U1536207);The National Key Research and Development Program of China(2016QY04W0803)

Abstract:

For security and efficiency problems in threshold based deduplication for cloud data,a novel method based on threshold re-encryption was proposed to deal with side channel attacks.A lightweight threshold re-encryption mechanism was presented to transfer the secondary encryption to the cloud for execution and allow clients to generate ciphertext based on key segmentation instead of ciphertext segmentation,both of which largely reduce computational overhead of clients.Also,the proposed mechanism enables clients to decrypt from both one-time encrypted and re-encrypted ciphertext,thus avoiding the overhead of redundant encryption of the same file.Mutual integrity verification between cloud service provider and clients was also supported by the proposed method,which directly ensured the correctness of the correspondence between ciphertext and plaintext on client side.Experiments show that the proposed method not only largely reduces the computational overhead on client side,but also achieves superior storage performance on cloud side simultaneously.

Key words: threshold deduplication, re-encryption, side channel attack, late verify

CLC Number: 

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