Leakage-Resilient Anonymous Identity-Based Broadcast Encryption in the Standard Model

Abstract

Anonymous encryption has many applications in real life. But there are no efficient works with anonymous feature to be known in the identity-based broadcast encryptionIBBE system. In addition, all existing IBBEs do not support leakage tolerance. In this paper, a new construction of anonymous identity-based broadcast encryption is proposed in the standard model. In the new construction, the ciphertexts and private keys are indistinguishable for the different receivers set. The proposed scheme has constant size ciphertexts and achieves adaptive security. In addition, the proposed scheme achieves leakage-resilient security. The security of the proposed scheme is reduced to some natural static assumptions in a composite group instead of other strong assumptions.