Welcome to the resource topic for 2004/212
Title:
ID-Based Encryption for Complex Hierarchies with Applications to Forward Security and Broadcast Encryption
Authors: Danfeng Yao, Nelly Fazio, Yevgeniy Dodis, Anna Lysyanskaya
Abstract:A forward-secure encryption scheme protects secret keys from exposure by evolving the keys with time. Forward security has several unique requirements in Hierarchical Identity-Based Encryption (HIBE) scheme: (1) users join dynamically; (2) encryption
is joining-time-oblivious; (3) users evolve secret keys autonomously.
We present a scalable forward-secure HIBE scheme satisfying the above properties. Note that a naive combination of Gentry-Silverberg HIBE scheme with the forward-secure Public-Key Encryption scheme by Canetti, Halevi and Katz would not meet the requirements. We also show how our fs-HIBE scheme can be
used to construct a forward-secure public-key Broadcast Encryption
scheme, which protects the secrecy of prior transmissions in the Broadcast Encryption setting. We further generalize fs-HIBE into a collusion-resistant Multiple Hierarchical ID-Based Encryption scheme, which can be used for secure communications with entities having multiple roles in Role-Based Access Control. The security of our schemes is based on the Bilinear Diffie-Hellman assumption in the random oracle model.
ePrint: https://eprint.iacr.org/2004/212
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