Title page for etd-0620117-132009


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URN etd-0620117-132009
Author I-Chia Chung
Author's Email Address No Public.
Statistics This thesis had been viewed 5339 times. Download 321 times.
Department Computer Science and Engineering
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title An Efficient Fault-tolerant Cloud Storage Scheme Based on Secret Sharing
Date of Defense 2017-07-18
Page Count 43
Keyword
  • secret sharing
  • cloud storage
  • cloud security
  • XOR
  • cloud computing
  • Abstract An efficient and fault-tolerant cloud storage scheme for file owners is presented in this paper.
    A large file is first divided into secrets, and each secret is then divided
    into shares by using a (k, l, L, n)-threshold secret sharing scheme.
    These shares are finally uploaded into n-l cloud storage servers.
    To retrieve the file, any k shares of each secret are first retrieved
    from some of the servers.
    The value of each secret can then be computed from these k shares, and
    the original files can then be assembled from these secrets.
    The scheme achieves the following security for the file owners:
    (1) Secrecy: at least k shares are obtained, the contents of the file
    cannot be reconstructed, including the cloud storage owner.
    (2) Fault-tolerant: Only need k shares to reconstruct the file.
    (3) Can be used to delete a file permanently: by letting k=n and store one
    share by the file owner.
    If the share stored by the file owner is deleted, the file can no longer
    be reconstructed any more.
    The proposed scheme adopted the Satoshi et al.'s secret sharing scheme and J. Kurihara et al's ramp secret sharing scheme to reduce
    the total storage required.
    It uses J. Kurihara et al's ramp secret sharing scheme, in which only XOR operations are
    needed to reduce the computational cost.
    The improvement is significant when n is small and the secret size is
    large, the efficiency of the scheme.
    Therefore, the proposed protocol is practical in cloud storage.
    Advisory Committee
  • Chia-Mei Chen - chair
  • Chun-I Fan - co-chair
  • D. J. Guan - advisor
  • John Y. Chiang - advisor
  • Files
  • etd-0620117-132009.pdf
  • indicate access worldwide
    Date of Submission 2017-07-21

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