一个基于身份的盲签名方案的改进

Improvement of Identity-Based Blind Signature Scheme

盲签名就是接收者在不让签名者获取所签署消息具体内容的情况下所采取的一种特殊的数字签名技术,它在安全电子商务中有着重要的应用。牛志华等学者提出了一个高效的基于身份的盲签名方案。该方案用以身份为基础的公钥取代了数字证书形式的公钥,提高了系统效率,节省了存储空间。但是,这一签名方案存在严重的构造错误。文中分析并改进了该方案,从而使方案的正确性得到了有效的验证。

Blind signature is a special signature technology, which allows the user to obtain the signature of a message in a way that the signer learns on content of the message. Such signature is important in secure e-commerce. Niu and others proposes an efficient ID-based blind signature scheme, which uses identity-based public key instead of digital-certificate public key, thus having improved efficiency of the system and reduced the storage space. However, several serious mistakes in their scheme are discovered. This paper analyzes and improves the scheme scheme, and the correctness of the scheme is thus effectively verified.