Security Analysis and Improvement of Some Proxy Multi-signature Schemes
Proxy multi-signature scheme is an important digital signature of modern electronic business.But many of them are insecure and have some different limitations.Security analysis of some proxy multi-signature schemes proposed re7cently is presented.This paper points out that these schemes are insecure and have different security weaknesses.In order to overcome these weaknesses,a novel proxy multi-signature scheme without a secure channel is proposed,and security and efficiency analysis of the improved scheme is presented.