基于虹膜信息的身份签名方案

生物特征的应用集中在两个方面，一是传统的身份认证和识别技术，二是密钥的产生技术。该文研究了从虹膜信息中提取特征码，采用模糊方法从虹膜特征码中提取随机串并将其嵌入到椭圆曲线中等问题。以虹膜信息为基础产生公钥，提出了一种基于虹膜信息的身份签名方案。该方案引进两个密钥生成系统，可有效防止单个密钥生成系统随意伪造签名的缺陷，进一步提高系统的安全性和可靠性。在随机预言机模型下，该方案被证明在适应性选择消息和身份攻击下具有不可伪造安全，并能有效抵抗生日攻击。

An Identity Signature Scheme Based on Iris Information

There are two focuses in biometric applications, one is the traditional authentication and identification technology, and another is the key generation technology. The character code extraction from iris information, the random string extraction from character code using fuzzy method and the embedding of random string in the elliptic curve are studied. A new digital identity signature scheme based on iris information is proposed, which takes the iris information as the public key. Using two independent PKGs, the proposed scheme could avoid the signature forgeability of the single PKG, hence it has more security and reliability. With the random oracle model, the proposed scheme is proved to have the unforgeability secure when adaptively choose plaintext and identity attack, and it can  effectively resist the birthday attack.