### ID-Based Encryption for Complex Hierarchies with Applications to Forward Security and Broadcast Encryption

Danfeng Yao, Nelly Fazio, Yevgeniy Dodis, and 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.

Available format(s)
Category
Public-key cryptography
Publication info
Published elsewhere. CCS 2004
Keywords
Contact author(s)
dyao @ cs brown edu
History
2004-08-30: revised
See all versions
Short URL
https://ia.cr/2004/212

CC BY

BibTeX

@misc{cryptoeprint:2004/212,
author = {Danfeng Yao and Nelly Fazio and Yevgeniy Dodis and Anna Lysyanskaya},
title = {ID-Based Encryption for Complex Hierarchies with Applications to Forward Security and Broadcast Encryption},
howpublished = {Cryptology ePrint Archive, Paper 2004/212},
year = {2004},
note = {\url{https://eprint.iacr.org/2004/212}},
url = {https://eprint.iacr.org/2004/212}
}

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