Optical Data Security

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  Due to the development digital computer technologies and digital television for the next generation, there is a growing demand to store large sizes of data. Optical technology can provide a number of ways to solve the problem of large storage and fast transmission of data.
Unlike bit-oriented optical memories such as DVD and CD, in optical storage two-dimensional data is stored as a hologram on a photosensitive crystal, by illuminating the interference pattern formed by an object beam and a reference beam. Using angle wavelength, and phase multiplexing techniques, one can store multiple images at the same position, thus increasing the storage capacity.
In practical systems, data security is an important issue. Optical encryption techniques provide a high level of security because there are many degrees of freedom with which to encode the information, such as amplitude, phase, wavelength, and polarization. To protect the stored information it is required to encrypt the data. Here the encryption means that the original data is converted into stationary white-noise data by key codes, and unauthorized users cannot obtain the original data without knowledge of the key code.?
Original data may be encoded optically by using various encryption techniques. Double random phase encryption, three dimensional position encryption and wavelength-code encryption are some of the major techniques of encryption available at present.

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