Affiliations: [a] School of Computer and Communication Engineering, Changsha University of Science and Technology, Changsha, 410114, China. gk4572@163.com | [b] School of Information Science and Engineering, Central South University, Changsha, 410083, China | [c] School of Computer and Communication Engineering, Changsha University of Science and Technology, Changsha, 410114, China
Correspondence:
[†]
Address for correspondence: School of Computer and Communication Engineering, Changsha University of Science and Technology, Changsha, 410114, China.
Note: [*] This work is supported by the National Natural Science Foundation of China (No. 61402055, No. 61462048) and the Scientific Research Project of Hunan Provincial Education Department (No. 15C0041, No. 15A007, No. 15C0779).
Abstract: Multi-proxy signature is a variant of proxy signature, which allows that a delegator (original signer) may delegate his signing rights to many proxy signers. Comparing with proxy signatures, multi-proxy signatures can effectively prevent that some of proxy signers abuse signing rights. Also, with the rapid development of identity-based cryptography, identity-based multi-proxy signature (IBMPS) schemes have been proposed. Comparing with proxy signature based on public key cryptography, IBMPS can simplify key management and be used for more applications. Presently, many identity-based multi-proxy signature schemes have been proposed, but most of them are constructed in the random oracle model. Also, the existing security model for identity-based multi-proxy signature is not enough complete according to the Boldyreva et al.’s work. In this paper, we present a framework for IBMPS on n + 1 users (n is the number of proxy signers participating in signing), and show a detailed security model for IBMPS. Under our framework, we present an identity-based multi-proxy signature scheme in the standard model. Comparing with other identity-based multi-proxy signature schemes, the proposed scheme has more complete security.
Keywords: multi-proxy signature, identity-based cryptography, identity-based multi-proxy signature, security model
