Analysis and design of ID-based threshold signcryption scheme
HU Yong-de · Jisuanji gongcheng yu sheji · 2009
Signcryption is a new cryptographic primitive which simultaneously fulfills both confidentiality and authenticity in a logically single step.The security deficiency and the limitation performance on its signatures verification are analyzed,which existed in the ID-based(t,n) threshold signcryption scheme proposed by Fagen Li.Then a new scheme is proposed based on the batch verification of signatures which could remedy the security deficiency of the primary scheme,and when the particular clerk succeeded in verifying party signatures,two bilinear pairs are needed to be computed only.The expectation of the bilinear pair computation is 2(tρ+1)(ρ is considered as the illegal rate of the party signatures aggregate),but not 2t in the primary scheme.