Abstract:

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.

Key words: optical holography, PIN code, fingerprint image