【作者】 张龙；

【导师】 胡舜耕；

【作者基本信息】 北京邮电大学 ， 信号与信息处理， 2009， 硕士

【摘要】 多媒体技术和网络技术(尤其是Internet技术)的发展和成熟,为数字媒体产业开创了一个崭新的时代。生物特征识别(本文关注于虹膜识别)技术可以为用户提供便捷的身份鉴别,从而保证数字媒体的内容安全,为数字媒体产业的发展奠定坚实的基础。然而,传统的虹膜识别系统存在着诸多安全方面的隐患。在虹膜识别系统所面临的各种安全问题中,本文主要研究了虹膜模板的安全问题及其保护机制。虹膜识别和密码学相结合的方法既保证了虹膜模板的安全,又可以对用户提供有效的身份鉴别和密钥管理,因此在信息安全领域有着广阔的应用前景。本文首先回顾了差错控制编码以及信息安全和密码学方面的基本理论,随后着重探讨了各种虹膜识别与密码技术结合的虹膜模板保护方法。在基于密钥绑定的虹膜识别系统中,差错控制编码方案的选取和虹膜特征信息的预处理算法是决定系统识别性能和安全性的关键。针对传统基于密钥绑定的虹膜识别技术中存在的不足,本文提出了两种方案对其进行改进,分别称之为基于可靠区域的密钥提取方案和基于均匀位遮挡的密钥提取方案。在这两种方案中,RS码与卷积码级联的差错控制编码方案增加了可从虹膜中提取的随机密钥长度,同时基于可靠区域和基于均匀位遮挡的虹膜预处理算法有效减小了虹膜的类内差异。实验结果表明本文中设计方案的合理、有效。更多还原

【Abstract】 Thanks to the rapid development of multimedia and network technology, the digital media industry has step into a new era. Biometrics (especially the iris recognition technology) can ensure the content security of digital media since it provides a convenient and reliable way for user authentication. However, there exist many security problems in traditional iris recognition systems.Among the security problems the iris recognition systems are confronted with, this paper focused on the iris template security and its protection mechanisms. The combination of iris recognition and cryptography can not only provide an efficient mechanism for template protection, but also facilitate cryptographic key management, thus becomes a promising direction in information security field.In this paper, we firstly reviewed the basic theories of error control coding, cryptography and information security, and then studied a variety of iris template protection scheme that combining iris recognition and cryptography. In the key binding iris cryptosystem, the error control coding scheme and the pre-processing algorithm of iris data are the key factors that determine the system recognition and security performance. Based on the shortages of the traditional key binding iris cryptosystem, we proposed two methods for its improvement, referred to as the reliable region based key extraction method and the bit masking based key extraction method, respectively. In these methods, the concatenated coding scheme that combines Reed-Solomon code and convolutional code is proposed so that much longer keys can be extracted from the iris data, while the pre-processing schemes are proposed to minimize the iris intra-class variation. The experiment results show that our proposed methods are reasonable and efficient.更多还原