两个标准模型下签名方案的密码学分析

为了分析和设计标准模型下安全的签名方案, 避免签名方案的设计中出现类似的安全性问题。 通过对标准模型下的无证书签名方案和前向安全的基于证书签名方案的分析, 发现该签名方案容易受到替换公钥攻击和后门攻击, 攻击者可以对任意的消息产生一个有效签名。 对这些攻击给出了具体分析, 同时探讨了克服这类攻击的方法。 研究结果表明, 这些攻击方法对于同类签名的分析与设计有借鉴意义。

Cryptanalysis of Two Signature Schemes in the Standard Model

In order to analyze and design secure signature schemes under the standard model, and avoid the similar security issues in designing signature schemes, a new certificateless signature scheme and a forward- secure certificate-based signature scheme in the standard model are analyzed. The results show that this signature scheme can suffer from public key replacement attack and backdoors attack, the attacker can generate a valid signature on any message. These attacks are analyzed concretely, the methods about how to overcome these attacks are discussed. These attack methods are reference significance for the analysis and design of similar signature.