CCA-Secure IB-KEM from Identity-Based Extractable Hash Proof System

Provided by: International Association for Cryptologic Research
Topic: Security
Format: PDF
In this paper, the authors introduce a general paradigm called Identity-Based Extractable Hash Proof System (IB-EHPS), which is an extension of Extractable Hash Proof System (EHPS) proposed by wee (CRYPTO '10). They show how to construct Identity-Based Key Encapsulation Mechanism (IB-KEM) from IB-EHPS in a simple and modular fashion. Their construction provides a generic method of building and interpreting CCA-secure IB-KEMs based on computational assumptions. As instantiations, they realize IB-EHPS from the bilinear Diffie-Hellman assumption and the modified bilinear Diffie-Hellman assumption, respectively.

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