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Identity-based Matchmaking Encryption (IB-ME) is a new form of encryption that enables anonymous communication by specifying identities for both sender and receiver. Its applications in network services put forward higher requirements for the security of IB-ME. According to existing research, the security definition of IB-ME against chosen-plaintext attacks or chosen-ciphertext attacks is still vague. In this paper, we give the first clear definition of CCA-security of IB-ME and propose the first CCA-secure IB-ME scheme under the standard assumptions in the standard model. We first construct a CCA-secure anonymous IBE scheme by combining anonymous hierarchical IBE with CHK CPA-CCA conversion at EUROCRYPT’04. Our proposed IB-ME scheme is a variant of two-level IBE, whose first level is this CCA-secure anonymous IBE, and the second level is a signature derived from this IBE. And its security is proven under standard assumptions and standard model.

Related Keywords

,Matchmaking Encryption ,Chosen Ciphertext Attack ,Identity Based Encryption ,Dentity Based Matchmaking Encryption ,Standard Model ,

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