These weak points can result in the adversary to cheat the verification group by forgery and substitution attack.
这样的漏洞使得敌手可利用伪造攻击和替换攻击对验证组进行欺骗；
Furthermore, using zero knowledge idea, a general approach to withstanding the public key substitution attack is given.
进一步利用零知识的思想给出了抵抗公钥替换攻击的一般方法。
Improved scheme has advantages of nonrepudiation, against he original signer's forgery attack and public key substitution attack etc.
改进的方案具有不可否认性，以及抵抗原签名人的伪造攻击和公钥替换攻击等优点。
Improved schemes have advantages of nonrepudiation, using insecure channel, against the public key substitution attack and collusion attack etc.
改进后的方案具有不可否认性，不使用安全信道，以及抵抗公钥替换攻击和合谋攻击等优点。
It is shown here that S-L-H scheme is insecure against the public key substitution attack and an improved threshold proxy signature scheme is proposed.
这里指出s - L - H方案不能抵抗公钥替换攻击，并给出了一个改进的门限代理签名方案。
Besides having the basic properties of the proxy signature, the new scheme prevents proxy misuse, original signer's forgery and public key substitution attack.
此外，该方案不仅满足代理签名的基本性质，还避免了代理权滥用、原始签名人伪造和公钥替换攻击。
Security analysis results show that compared with L-L-C-Z threshold proxy signcryption protocol, the improved threshold proxy signcryption protocol can withstand the public key substitution attack.
安全分析结果表明，与L - L - C - Z门限代理签密协议相比，该改进门限代理签密协议能够承受接收方公钥替换攻击。
Substitution of methyl group at 1,2 and 3 position on 1-methylindole, 2-methylindole and 3-methylindole inhibits initial microbial attack significantly.
同时，1、2或3位上的甲基替代使1 甲基吲哚，2 甲基吲哚和3 甲基吲哚的降解受到严重抑制。
Substitution of methyl group at 1,2 and 3 position on 1-methylindole, 2-methylindole and 3-methylindole inhibits initial microbial attack significantly.
同时，1、2或3位上的甲基替代使1 甲基吲哚，2 甲基吲哚和3 甲基吲哚的降解受到严重抑制。
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