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Timed-Release and Key-Insulated Public Key Encryption

Added by Papergrl

Description: In this paper we consider two security notions related to Identity Based Encryption: Key-insulated public key encryption and Timed-Release Public Key cryptography. We first formalize the notion of secure timed-release public key encryption, and show that, despite several differences in its formulation, it is equivalent to strongly key-insulated public key encryption (with optimal threshold and random access key updates). Next, we introduce the concept of an authenticated timed-release cryptosystem, briefly consider generic constructions, and then give a construction based on a single primitive which is efficient and provably secure.