基于三角拓扑结构的指纹加密方案

Fingerprint Encryption Scheme based on Triangle Topology

模糊金库作为生物加密领域的经典算法已得到广泛应用。在模糊金库方案的基础上,提出一种基于三角拓扑结构的指纹加密方案。首先提取带有三角拓扑结构的指纹特征细节点,然后构造多元线性函数,将细节点映射到多元线性函数上,添加干扰集,生成指纹加锁集。在解锁时,比对样板细节点和模板细节点三角拓扑结构,对样板图像进行配准。实验结果表明,该方案解决了样板指纹需要提前配准的问题,同时很大程度上缩减了秘密信息恢复的时间,提高了系统的效率。

Fuzzy vault,as a classical encryption algorithm,is widely used in biometric encryption.Based on Fuzzy Vault scheme by Jules et al.,this paper proposes a fingerprint encryption scheme triangular topology.Firstly,the fingerprint minutiae feature with a triangular topology is extracted,and then multiple linear functions are constructed,finally,the minutiae is mapped onto multiple linear functions,the inteference set added,and the fingerprint locking set generated.Sample image is registrated by comparing triangle topology of sample minutiae with template minutiae during the unlocking process.Experimental results show that this scheme could solve the advanced registration of sample fingerprint while greatly reducing the time for secret information recovery,thus the system efficiency is improved.