最近, Hwang et al.proposed 一( t , n )阀值代理( c , m )阀值签名计划,在哪个仅仅任何 t 或 n 原版签名人的更原来的签名人能授权 m 代理签名人然后仅仅 c 的一个代理组或更多代理签名人 co 能起作用地产生阀值代理 threshold-signature.In 这个计划,他们宣称原来的签名人不能伪造代理签名,代理签名人不能代表原来的 signers.However 伪造签名,在这份报纸,我们将把攻击给嘘
Recently,Hwang et al.proposed a (t,n) threshold-proxy (c,m) thresholdsignature schemes,in which only any t or more original signers of n original signers can authorize a proxy group of m proxy signers and then only c or more proxy signers can cooperatively generate threshold-proxy threshold-signature.In this scheme,they claimed that original signers cannot forge the proxy signature and the proxy signers cannot forge signature on behalf of the original signers.However,in this paper,we will give a attack to show that their scheme can not resist impersonation attacks.