基于混沌映射的可撤销自动配准指纹加密方案

Cancelable Auto-Aligned Fingerprint Cryptosystem based on Chaos Mapping

模糊金库是一种应用广泛的典型生物加密框架,在此基础上,结合指纹,文中提出一种基于混沌映射的可撤销自动配准指纹加密方案,基于随机数,通过构造单向的,带有可撤销参数的自动配准函数和混沌映射变换,变换指纹细节点,组成不包含原始指纹信息的指纹加锁集,即使攻击者得到指纹加锁集,也无法获得任何指纹隐私。由于对同一指纹,只要改变随机数,就能产生新的指纹加锁集,降低了交叉匹配带来的隐患。最后,结合实验表明,提出的方案能够有效保护指纹隐私和系统密钥。

Fuzzy Vault is a typical encryption framework which is widely used. On this basis, combined with fingerprints, a cancelable auto-aligned fingerprint cryptosystem based on chaos mapping is proposed. It can transform fingerprint minutiae by constructing a one-way auto-aligned function and chaos mapping function with cancelahle parameters, based on a random number. Then, a fingerprint locking set which includes transformed minutiae instead of the original fingerprint information is generated. Although the attackers steal the set, they couldn＇ t gain the fingerprint privacy. For the same fingerprint, as long as the random number is changed, a new fingerprint locking set is created. It reduces the hidden trouble of cross match. Finally, the experimental results indicate that the proposed scheme can effectively protect the fingerprint privacy and key of system.