A secure key-aggregate authentication cryptosystem for data sharing in dynamic cloud storage

Kobra Alimohammadi | Majid Bayat | Hamid Haj Seyyed Javadi

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=137139
Date :  2019/12/03
Publish in :    Multimedia Tools and Applications

Link :  https://link.springer.com/article/10.1007/s11042-019-08292-8
Keywords :Aggregate key, Authentication, cryptosystem, Cloud storage, Data sharing

Abstract :

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The ability of data owner in secure and efficient arbitrary data sharing with others is of great importance in the outsourced encrypted data on the cloud. To protect data confidentiality, data owner encrypts his files before storing information on the cloud. Data sharing schemes are used to share encrypted files with others. Guo et al.’s data sharing scheme in dynamic cloud storage is evaluated in this paper. We investigate its vulnerability against DoS and impersonation attacks. In this scheme, anyone can forge the authentication key and access any arbitrary set of files stored on the cloud. We present a new scheme to overcome the weaknesses. Moreover, we evaluate the security and efficiency of our scheme comparing to some related ones. The results indicate that the proposed scheme is suitable for data sharing in dynamic cloud storage.