L. Malina*, J. Hajny, P. Dzurenda and V. Zeman

Department od Telecommunications Brno University of Technology Brno, Czech Republic. *malina@feec.vutbr.cz

ABSTRACT

We propose a novel privacy-preserving security solution for cloud services. Our solution is based on an efficient non-bilinear group signature scheme providing the anonymous access to cloud services and shared storage servers. The novel solution offers anonymous authenticationfor registered users. Thus, users' personal attributes (age, valid registration, successful payment) can be proven without revealing users' identity, and users can use cloud services without any threat of profiling their behavior. However, if a user breaks provider's rules, his access right is revoked.Our solution provides anonymous access, unlinkability and the confidentiality of transmitted data. We implement our solution as a proof of concept applicationand present the experimental results. Further, we analyzecurrent privacy preserving solutions for cloud services and group signature schemes as basic parts of privacy enhancing solutions in cloud services. We compare the performance of our solution with the related solutionsand schemes.

Keywords: Anonymous authentication, Cloud services, Cryptography, Encryption, Group signatures, Privacy, Security.

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Acknowledgments

This research work is funded by project SIX CZ.1.05/2.1.00/03.0072; the Technology Agency of the Czech Republic projects TA02011260 and TA03010818; the Ministry of Industry and Trade of the Czech Republic project FR-TI4/647.

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