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Forward-Secure Hierarchical IBE with Applications to Broadcast Encryption 1
| Content Provider | CiteSeerX |
|---|---|
| Author | Anna Lysyanskaya, D. |
| Abstract | 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 en-cryption scheme, which protects the secrecy of prior transmissions in the broadcast encryption setting. We further generalize fs-HIBE into a collusion-resistant multi-ple hierarchical ID-based encryption scheme, which can be used for secure com-munications 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. |
| File Format | |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
