Affiliations: [a] School of Information Engineering, Chang’an University, Xi’an 710064, China. yangming@chd.edu.cn | [b] State Key Laboratory of Integrated Services Network, Xidian University, Xi’an 710071, China. ymwang@xidian.edu.cn
Correspondence:
[*]
Address for correspondence: School of Information Engineering, Chang’an University, Middle Section of Nan Erhuan Road, Xi’an 710064, China.
Note: [†] This work is supported by in part by the National Natural Science Foundation of China (No. 61202438), the Key Project of Industry Science and Technology of Shaanxi Province (No. 2015GY014) and the Project of Science and Technology of Xi’an City (No. 2017088CG/RC051(CADX002)).
Abstract: Proxy signature is extension of the standard signature, in which the original signer can delegate his or her signing capability to proxy signer in such a way that the latter can sign messages on behalf of the former. Certificateless cryptography eliminates the need of certificates in the traditional public key cryptography and solves the inherent key escrow problem in the identity based cryptography. In this paper, we extend security model of proxy signature to certificateless setting and formalize the security model of certificateless proxy signature. We propose a certificateless proxy signature scheme with concrete implementation which is probably secure in the standard model. Furthermore, the proposed scheme is proven to be existentially unforgeable under the hardness of the computational Diffie-Hellman problem.
Keywords: Proxy signature, Certificateless cryptography, Certificateless proxy signature, Bilinear pairings, Standard model
