一种基于指纹特征比特串的可撤销指纹加密方案

A cancellable fingerprint bio-cryptosystem based on fingerprint binary string

本文以指纹作为生物识别的研究对象,在保护指纹隐私安全的前提下,研究基于模糊提取的可撤销指纹加密方案.首先,在注册阶段,通过检测指纹奇异点并以指纹奇异点为基础,从指纹图片中提取二进制串序列作为指纹特征信息,再将二进制串结合BCH纠错编码和模糊提取技术生成指纹密钥和辅助数据.最后只要待鉴别指纹为同源指纹,同时结合辅助数据,便可恢复出指纹密钥,通过身份鉴别.实验结果表明,方案具有较高的鉴别性能.安全性分析表明,该方案具有较高的安全性,可以满足现有需求.

The cancellable fingerprint bio-cryptosystems based on the fingerprint binary string is study under the premise of protecting the security of fingerprint privacy. During the registration, first detect the fingerprint singular point as the base point, and extract the binary string from the fingerprint as the fingerprint feature, then generate the fingerprint key and auxiliary information by combining the error- correct code and fuzzy scheme. Finally, during the authentication, the fingerprint key could be recovered by auxiliary information and homology fingerprint. Experiments demonstrate that the proposed biomet- tic cryptosystem has good recognition performance. And security analysis indicates that the security strength of the proposed biometric cryptosystem can satisfy the need of current security circumstances.