门限代理门限签名方案的密码学分析(英文)

• 作 者: 韩金广 亢保元
• 机 构: College of Scienc,Hohai University,School of Computer Science and Software Engineering,Tianjin Polyt
• 出 处: 数学季刊
• 发表日期: 2010年03期
• 关键词: 门限签名 signature proxy signer resist forge behalf secret certificate message

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.

Recently, Hwang et al .proposed a (t, n) threshold-proxy (c, m) thresholdsignature schemes, in which only only or t 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 the original signers can not forge the proxy signature and the proxy signers can not 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.