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Published in:
2014 | OriginalPaper | Chapter
Towards Time-Bound Hierarchical Key Assignment for Secure Data Access Control
Authors : Tsu-Yang Wu, Chengxiang Zhou, Chien-Ming Chen, Eric Ke Wang, Jeng-Shyang Pan
Published in: Multidisciplinary Social Networks Research
Publisher: Springer Berlin Heidelberg
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Time-bound hierarchical key assignment (TBHKA) scheme is a cryptographic method to assign encryption keys to a set of security classes in a partially ordered hierarchy. Only the authorized subscriber who holds the corresponding key can access the encrypted resources. In 2005, Yeh proposed a RSA-based TBHKA scheme which is suitable for discrete time period. However, it had been proved insecure against colluding attacks. Up to now, no such TBHKA schemes were proposed. In this paper, we fuse pairing-based cryptography and RSA key construction to propose a secure TBHKA scheme. In particular, our scheme is suitable for discrete time period. The security analysis is demonstrated that our scheme is secure against outsider and insider attacks (including colluding attacks). Finally, the performance analysis and comparisons are given to demonstrate our advantage.