Provably Secure Anonymous Multi-Receiver Identity-Based Encryption with Shorter Ciphertext

Anonymous multi-receiver identity-based encryption (ID-MRE) can protect the receiver identity besides message confidentiality. It can be applied in many fields, such as VoIP (Voice over Internet Protocol) and pay-TV systems. Based on the bilinear pairings, this paper proposes an anonymous ID-MRE scheme. The proposed scheme satisfies the indistinguishability of encryptions under selective multi-identity, adaptive chosen ciphertext attacks (IND-sMID-CCA2). On the other hand, it also satisfies the anonymous indistinguishability of encryptions under selective multi-identity, adaptive chosen ciphertext attacks (ANON-sMID-CCA2). The security analysis and performance analysis show that our scheme is provably secure and efficient.