摘要
通过对张建中等人提出的基于身份的门限代理签名方案进行安全分析,发现该方案不能抵御合谋攻击,任意t个代理签名人都可以合谋获得其他n-t代理签名人用来生成代理密钥的足够信息,从而伪造他们进行签名。为了避免这种攻击,提出了一种新的基于身份的门限代理签名,新方案克服了原方案的安全缺陷,不仅能够抵抗合谋攻击,而且满足门限代理签名方案的安全要求。相比已有方案,新方案在代理密钥生成、代理签名生成和总运算量具有明显的优势。
Through the cryptanalysis of identity-based threshold proxy signature proposed by ZHANG Jianzhong,which can not resist conspiracy attack,it is shown that any t proxy signers can conspire to gain enough information of other n-t proxy signers to generate proxy key and forge their signature.To avoid this attack,a new identity-based threshold proxy signature is proposed,which can resolve the security problem existing in existing scheme.The new scheme can resist the conspiracy attack and meets the safe requirements of threshold proxy signature scheme.Compared with existing scheme,the proposed scheme has obvious advantages in proxy key generation,proxy signature generation and total amount of calculation.
出处
《计算机与数字工程》
2012年第2期72-74,共3页
Computer & Digital Engineering
关键词
基于身份
门限代理签名
合谋攻击
ID-based
bilinear pairing
threshold proxy signature
conspiracy attack
