Title: Efficient and secure data sharing with outsourced decryption and efficient revocation for cloud storage systems

Authors: Imad El Ghoubach; Rachid Ben Abbou; Fatiha Mrabti

Addresses: Intelligent Systems and Applications/Signals, Systems and Components Laboratories, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, Fez, Morocco ' Intelligent Systems and Applications Laboratory, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, Fez, Morocco ' Signals, Systems and Components Laboratory, Faculty of Sciences and Technology, Sidi Mohamed Ben Abdellah University, Fez, Morocco

Abstract: Data access control is one of the major issues in cloud storage systems, especially when having multiple co-existing authorities requiring a multi-authority access control scheme. Existing multi-authority systems were able to achieve the required level of security and fine-grained access control, but since the cloud services can be accessed using devices with various computation capabilities, it is highly required to have a scheme with efficient encryption and decryption operations. In this paper, we propose a scheme able to achieve the desired level of security and fine-grained access control while having an efficient revocation operation. Moreover, we were able to increase the efficiency of the decryption operation by outsourcing most of the computation to a proxy-server without compromising the confidentiality of the data. In addition, we propose the usage of parallel processing in order to increase the efficiency of the various operations to efficiently use the computational power in low-end devices and the proxy-server. The analysis and simulation results show that ESS-ODER is efficient and provably secure.

Keywords: access control; encryption; cipher-text policy attribute-based encryption; CP-ABE; decryption outsourcing; fine-grained access control; attribute revocation; multi-authority cloud; forward security; backward security; parallel computing.

DOI: 10.1504/IJSN.2019.101413

International Journal of Security and Networks, 2019 Vol.14 No.3, pp.133 - 145

Available online: 19 Jul 2019 *

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