Computer and Modernization ›› 2021, Vol. 0 ›› Issue (10): 119-126.

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Security-enhanced Data Access Control for Multi-authority Cloud Storage

  

  1. (1. Information Center, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China;

    2. Chongqing Ecological Environment Big Data Application Center, Chongqing 401147, China;
    3. College of Computer Science, Chongqing University, Chongqing 400044, China)

  • Online:2021-10-14 Published:2021-10-14

Abstract: Cloud storage has brought many advantages, such as saving users hardware purchase costs and providing real-time online data storage services. More and more people are choosing to store data on the cloud. In order to improve data security and data privacy, Wu et al. gave an extended data access control scheme for multi-authority cloud storage (NEDAC-MACS) on the basis of the scheme of Yang. In this paper, an attack method is given to demonstrate that a revoked user can still decrypt new ciphertexts in NEDAC-MACS, and a scheme to enhance the security of NEDAC-MACS is proposed, which can resist the collusion attack between cloud server and users. Cryptographic analyses confirm that the scheme is able to resist collusion attacks and is feasible.

Key words: access control, data security, collusion attack, cloud storage