Information security based on fourier plane random phase coding and optical scanning

Abstract

An information security method is presented by use of electrooptic cryptosystem. We investigate Fourier plane random phase encoding technique, a random phase coding, and holographic coding. The proposed cryptosystem is based on those combined coding technique. The target information is first random phase encoded and then multiplied by a Fourier plane random phase code and further processed into holographic coding. The electro-optic cryptosystem can be implemented in a manner that produced output of the encrypted information is to be directly sent through an antenna to a secure site for digital storage. In addition, the system has a capability of producing the encrypted information in real-time. In secure site, the encrypted information is, together with a decryption key, processed for decryption. If the encryption key and decryption key are matched, the decryption unit will decrypt the information. The proposed electro-optic cryptosystem enables us to store, transmit, and decrypt the encrypted data. We develop the theory of technique and substantiate it with simulation results. © Springer-Verlag 2004.