Title: PRE+: dual of proxy re-encryption for secure cloud data sharing service

Authors: Xu An Wang; Fatos Xhafa; Jianfeng Ma; Leonard Barolli; Yunlong Ge

Addresses: School of Telecommunications Engineering, Xidian University, Xi'an, P. R. China; State Key Laboratory of Cryptographic Science and Technology, Beijing, P. R. China; Department of Electronic Technology, Key Laboratory of Information and Network Security, Engineering University of Chinese Armed Police Force, Xi'an, P. R. China ' Department of Computer Science, Technical University of Catalonia, Barcelona, Spain ' School of Cyber Engineering, Xidian University, Xi'an, P. R. China ' Department of Information and Communication Engineering, Fukuoka Institute of Technology, Fukuoka, Japan ' Department of Electronic Technology, Officer College of Chinese Armed Police Force, Chengdu, P. R. China.

Abstract: In this paper, aiming at providing secure cloud data sharing services in cloud storage, we propose a scalable and controllable cloud data sharing framework for cloud users: Scanf. Towards proposing this framework, we introduce a new cryptographic primitive: PRE+, which can be seen as the dual of traditional proxy re-encryption (PRE) primitive. All the traditional PRE schemes until now require the delegator (or the delegator and the delegatee cooperatively) to generate the re-encryption keys. We observe that the encrypter also has the ability to generate re-encryption keys. Based on this observation, we construct a new PRE+ scheme, which is almost the same as the traditional PRE except the re-encryption keys generated by the encrypter. Compared with PRE, PRE+ can easily achieve the non-transferable property and message-level-based fine-grained delegation. Our Scanf framework based on PRE+ can also achieve these two properties, which is very important for cloud storage sharing service.

Keywords: dual of proxy re-encryption; message-level-based fine-grained delegation; non-transferable property; secure cloud data sharing service.

DOI: 10.1504/IJWGS.2018.088394

International Journal of Web and Grid Services, 2018 Vol.14 No.1, pp.44 - 69

Available online: 05 Dec 2017

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