Forward-Secure Hierarchical IBE with Applications to Broadcast Encryption
Danfeng Daphne Yao, Nelly Fazio, Yevgeniy Dodis, Anna Lysyanskaya · IOS Press eBooks · 2009
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.