Abstract
An encrypted optical memory system using double random phase codes in the
Fresnel domain is proposed. In this system, two random phase codes and their
positions form three-dimensional keys for encryption of images and are used
as keys to recover the original data. The third dimension is the positions
of the codes, which can have as many as three degrees of freedom. Original
images encrypted by use of the two phase codes located in the Fresnel domain
are stored holographically in a photorefractive material. We demonstrate in
preliminary experiments encryption and decryption of optical memory in a photorefractive crystal by use of angular multiplexing.
© 1999 Optical Society of America
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