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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Simple, Efficient and Strongly KI-Secure Hierarchical Key Assignment Schemes
verfasst von : Eduarda S. V. Freire, Kenneth G. Paterson, Bertram Poettering
Erschienen in: Topics in Cryptology – CT-RSA 2013
Verlag: Springer Berlin Heidelberg
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Hierarchical Key Assignment Schemes can be used to enforce access control policies by cryptographic means. In this paper, we present a new, enhanced security model for such schemes. We also give simple, efficient, and strongly-secure constructions for Hierarchical Key Assignment Schemes for arbitrary hierarchies using pseudorandom functions and forward-secure pseudorandom generators. We compare instantiations of our constructions with state-of-the-art Hierarchical Key Assignment Schemes, demonstrating that our new schemes possess an attractive trade-off between storage requirements and efficiency of key derivation.