Certificateless signcryption scheme to against known ephemeral secret security
Yi He · Jisuanji gongcheng yu sheji · 2012
In order to ensure that certificateless signcryption scheme could achieve the known ephemeral secret security,a new certificateless signcryption scheme without pairing is proposed in this paper.The new signcryption scheme correspond the user's partial private key,the user's private secret and the signcryption ephemeral secrets to three different CDH(computational Diffie-Hellman) problems respectively,and then use the hash function to combine the user key and the ephemeral secrets with user's identity.It is proved in this paper that the new scheme not only achieves data authentication and confidentiality,but also ensures the known ephemeral secret security.Comparative analysis shows that the new scheme wins more secure and better computing performance.In addition,it is pointed out that the signcryption scheme in reference [3] cannot resist the known ephemeral secret attacks.