中文摘要：

江明明等在2014年提出的格上代理签名方案,不能提供代理授权的公开可验证性,且需要安全信道来传输授权信息。针对这一问题,引入授权证书,提供了代理授权的公开可验证性,解除了原方案对安全信道的依赖。同时,改变原方案的授权方式,将代理签名的签名操作次数从2次降到了1次,提高了方案效率。另外,改进方案还引入了一个撤销列表,实现了代理授权在有效期内的撤销功能。分析表明,相比较于江明明等人的方案,新方案从安全性和效率上,都有了较大的改进。

英文摘要：

Jiang＇s lattice-based proxy signature scheme couldn＇t provide public verifiability of delegation,and depends on the existence of secure channel to transmit delegation information. To solve this problem,an improved scheme was presented by introducing the warrant to realize the delegation＇s public verifiability and getting rid of the dependence on secure channel. Furthermore,in the new proxy signature algorithm,authorization method was changed,and the basic signature operation downed from two times to one time,so that the scheme＇s efficiency was further improved. In addition,a revocation list was introduced,and the delegation revocation was achieved during the period of validity. The proposed scheme has with better security and efficiency compared to Jiang＇s scheme.