本文提出了一种基于光学全息的“指纹锁”，将其放置在智能卡的 IC 芯片前面，用于对用户的个人识别号( PIN码)进行预先加密和认证，和智能卡原有的数字加密算法相结合，可进一步提高信息存储和提取的安全性.该指纹锁是以指纹图像和随机相位板为密钥，记录在光折变晶体材料内的一组角度复用加密全息图.这种光学加密全息图与传统的角度复用全息图不同，其参考光兼有指纹密钥的振幅调制和随机相位调制，具有私密性好、携带方便、安全性高等优点.

In this paper，we propose a fingerprint lock that combines fingerprint verification

and optical holo- graphic encryption. It is placed in front of the IC chip of the smart card to

pre-encrypt and authenticate the user's PIN code，and strongly enhances the protection of

smart-card. Actually，the proposed fingerprint lock uses the fin- gerprint image as the key and

records the angle multiplexing optical encrypted hologram in the photorefractive crystal

material. This kind of hologram is different from the traditional angle multiplexed volume

hologram. Its refer- ence light has both amplitude modulation of fingerprint image and random phase

modulation. It has the advantages of good privacy，convenient carrying and high security.

Numerical simulations confirm the validity and safety of pro- posed technique.