A forgery attack is presented on the self-certified signature scheme.
本文对一种自证明签名方案实施了伪造攻击。
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。
Through the analysis of two proxy blind signature schemes, we want to prove that this two proxy blind signature schemes can not resist forgery attack and both have linkability.
对两个代理盲签方案及其安全性进行分析，证明了这两个方案不具有不可伪造性和不可链接性。
Through the cryptanalysis of a new threshold proxy signature scheme based on bilinear pairings, it is found that the scheme cant resist forgery attack and public-key substitute attack.
给出了对一个已有的高效无证书签名方案的替换公钥攻击，表明了在该方案中，攻击者可以通过替换签名者公钥伪造签名；进而针对该攻击提出了改进方案。
After analyzing a proxy blind signature scheme proposed by Huang et al., it was pointed out that the scheme was insecure against the original signer and signature receiver's forgery attack.
通过对黄辉等人提出的代理盲签名方案的分析，指出该方案不满足不可伪造性，原始签名者和签名接收者都可以伪造代理签名者的盲签名。
After analyzing a proxy blind signature scheme proposed by Huang et al., it was pointed out that the scheme was insecure against the original signer and signature receiver's forgery attack.
通过对黄辉等人提出的代理盲签名方案的分析，指出该方案不满足不可伪造性，原始签名者和签名接收者都可以伪造代理签名者的盲签名。
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