关键词: 匿名加密, 素数阶群, 基于身份, 标准模型

Abstract:

In order to protect private information of users in the identity-based encryption (IBE) scheme, an anonymous IBE scheme in groups of prime order is proposed using asymmetric bilinear maps. Data security and receiver anonymity are realized. The attacker cannot obtain the receiver's identity from the ciphertext. Based on decisional bilinear Diffie-Hellman (DBDH) assumption, it is adaptive-ID secure without random oracles. The scheme in groups of prime order greatly reduces computational overhead compared with the ones in groups of composite order. The proposed scheme improves security and efficiency of anonymous IBE schemes simultaneously.

Key words: anonymous encryption, prime order group, identity-based, without random oracles