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.
