基于双线性对,提出了一个基于身份的签密方案.在计算Diffie-Hellman (CDH)问题困难的假设下,证明了方案在随机预言模型下能够抵抗自适应性选择消息和身份攻击.方案基于身份,不需要证书,从而简化了密钥管理.此外,所提方案不仅可用于公开验证,在不需要泄露接收者私钥的前提下,可由第三方认证密文确实是对应明文的有效签密值.%Using bilinear pairing, a new identity-based signcryption scheme was proposed in this paper. Under the assumption that the Computational Diffie-Hellman (CDH) problem is hard, the newly proposed scheme had been proved to be secure against the existing unforgeability on adaptively chosen message/ciphertext and identity attack in random oracle model. The advantage of the proposed scheme is that it is identity-based which needs no certificates so that it has a simple key management. In addition, the proposed scheme can provide public verifiability, and it allows a third party to convince that the signcryption is valid for the given message without providing the receiver's private key.
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