@inbook{3bbff5b981dc4c70b0c58346c7f26fb5,
title = "Forward-secure hierarchical IBE with applications to broadcast encryption",
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 define and construct a scalable pairing-based forward-secure HIBE (fs-HIBE) scheme satisfying all of the above requirements. We also show how our fs-HIBE scheme can be used to realize 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.",
keywords = "Forward security, ID-based encryption, broadcast encryption",
author = "Danfeng Yao and Nelly Fazio and Yevgeniy Dodis and Anna Lysyanskaya",
year = "2009",
doi = "10.3233/978-1-58603-947-9-100",
language = "English (US)",
isbn = "9781586039479",
series = "Cryptology and Information Security Series",
publisher = "IOS Press",
pages = "100--118",
booktitle = "Identity-Based Cryptography",
}