Spread space spread spectrum technique for secure multiplexing
B.M. Hennelly, T.J. Naughton, J.B. McDonald, J.T. Sheridan, G. Unnikrishnan, D.P. Kelly, and B. Javidi
Opt. Lett. 32(9), 1060-1062 (2007)
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Abstract
A novel technique of multiplexing complex images is proposed in which each image may be demultiplexed only
if a set of random encryption keys is known. The technique utilizes the ability of the double random phase
encoding method to spread a signal's energy in both the space and spatial frequency domains in a controlled
manner. To multiplex, images are independently encrypted with different phase keys and then superimposed
by recording sequentially on the same material. Each image is extracted using the particular key associated
with it. During decryption the energy from the other images is further spread making it possible to minimize
its effects by using suitable filters. Wigner analysis is applied to the technique, and numerical results are presented.
Keywords (OCIS): 070.6020 Signal processing, 090.4220 Multiplex holography, 070.2580 Fourier optics.
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Copyright 2007 OSA
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