Secure optical data storage with random phase key codes by use of a configuration of a joint transform correlator.

A secure optical storage based on a configuration of a joint transform correlator by use of a photorefractive material is presented. A key code designed through the use of an optimized algorithm so that its Fourier transform has a uniform amplitude distribution and a uniformly random phase distribution is introduced. Original two-dimensional data and the key code are placed side-by-side at the input plane. Both of them are stored in a photorefractive material as a joint power spectrum. The retrieval of the original data can be achieved with the same key code. We can record multiple two-dimensional data in the same crystal by angular multiplexing and/or key code multiplexing.

[1]  D Psaltis,et al.  Optical network for real-time face recognition. , 1993, Applied optics.

[2]  B Javidi,et al.  Optical image encryption based on input plane and Fourier plane random encoding. , 1995, Optics letters.

[3]  B. Javidi,et al.  Encrypting three-dimensional information with digital holography. , 2000, Applied optics.

[4]  A. Lohmann,et al.  Complex spatial filtering with binary masks. , 1966, Applied optics.

[5]  D Psaltis,et al.  Method for controlling the shift invariance of optical correlators. , 1999, Applied optics.

[6]  G. Unnikrishnan,et al.  Optical encryption by double-random phase encoding in the fractional Fourier domain. , 2000, Optics letters.

[7]  B. Javidi,et al.  Encrypted optical storage with wavelength-key and random phase codes. , 1999, Applied optics.

[8]  F. Mok,et al.  Angle-multiplexed storage of 5000 holograms in lithium niobate. , 1993, Optics letters.

[9]  B Javidi,et al.  Optical encryption system with a binary key code. , 2000, Applied optics.

[10]  B Wang,et al.  Shift-tolerance property of an optical double-random phase-encoding encryption system. , 2000, Applied optics.

[11]  Katsuhisa Hirokawa.  Digital halftoning for computer-generated holograms , 1996, International Commission for Optics.

[12]  A W Lohmann,et al.  Binary fraunhofer holograms, generated by computer. , 1967, Applied optics.

[13]  B Javidi,et al.  Optoelectronic information encryption with phase-shifting interferometry. , 2000, Applied optics.

[14]  B Javidi,et al.  Securing information by use of digital holography. , 2000, Optics letters.

[15]  B Javidi,et al.  Secure optical storage that uses fully phase encryption. , 2000, Applied optics.