Computer Science

Computer Science ›› 2020, Vol. 47 ›› Issue (9): 330-338.doi: 10.11896/jsjkx.190800147

• Information Security • Previous Articles    

High Trusted Cloud Storage Model Based on TBchain Blockchain

LI Ying1,2, YU Ya-xin1,2, ZHANG Hong-yu1, LI Zhen-guo1   

  1. 1 School of Computer Science and Engineering,Northeastern University,Shenyang 110819,China
    2 Key Laboratory of Intelligent Computing of Medical Imaging,Ministry of Education,School of Computer Science and Engineering,Northeastern University,Shenyang 110819,China
  • Received:2019-08-29 Published:2020-09-10
  • About author:LI Ying,born in 1994,postgraduate.Her main research interests include blockchain and cloud computing.
    YU Ya-xin,born in 1971,Ph.D,asso-ciated professor,MS supervisor,is a member of China Computer Federation.Her main research interests include data mining and social network.
  • Supported by:
    National Natural Science Foundation of China (61871106),Research on Theory of Super-resolution ComputationalImaging Based Optical Diffraction in Freeform Lens (61973059) and National Key Research and DevelopmentProgram of China (2016YFC0101500).

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Abstract: Data stored in the cloud can be illegally stolen or tampered with,exposing users’ data to confidentiality threats.In order to store mass data more safely and efficiently,this paper proposes a storage model CBaaS(Cloud and Blockchain as a service) that supports the combination of index,traceability and verifiability of Cloud storage and Blockchain,which can enhance the credibility of data in the Cloud.Secondly,blockchain consensus protocol leads to low throughput and slow processing speed of transactions,which seriously restricts the development of decentralized applications.Based on this,this paper implements a three-tier architecture Blockchain model TBchain,which improves the scalability of the Blockchain and the throughput of transactions in the blockchain by dividing a part of the blockchain and locking it in the block of a higher level blockchain.Next,due to the demand of decentralization,blockchain occupies a large amount of storage space of massive nodes,which greatly limits the development and application of the database system based on blockchain technology.Part of the transaction is stored locally through TBchain,which increases the scalability of blockchain capacity.The ETag in the cloud storage object metadata is used to identify the contents of an Object and can be used to check if the contents of the Object have changed.By storing the object metadata in the cloud storage on the blockchain,the ETag value can be used to check whether the content of the Object changes and the data on the blockchain can not be tampered with to verify whether the data stored on the cloud is safe and improve the reliability of the data stored on the cloud.The experimental results show that the TBchain model improves the scalability and storage capacity scalability of the blockchain,and the CBaaS model also improves the reliability of data stored in the cloud.

Key words: Highly trusted cloud storage, Metadata, Scalability, Storage scalability, Three-tier hierarchical blockchain

CLC Number: 

  • TP311
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