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20 March 2001 Evaluation of correlation in optical encryption by using visual cryptography
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Visual cryptography made it possible to decrypt the information encrypted by thresholding scheme not with digital system but with human vision system. This method, however, has some limit in it because of the rack of resolution in both the spatial and amplitude domain. Optical visual cryptography, which used laser system instead of human eyesight, was proposed by conjunction of the optical theory with the cryptography. However, it also had some difficulties because it did not overcome the existing problem of visual cryptography completely. The problems occurred in the process of transferring data processing system from visual to optics. Therefore, it is appropriate to approach these problems in terms of optics. The results show that the optical visual cryptograph system has both the effectiveness and reliability as well as real-time implementation property.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sang-Yi Yi, Chung-Sang Ryu, Dae-Hyun Ryu, and Seung-Hyun Lee "Evaluation of correlation in optical encryption by using visual cryptography", Proc. SPIE 4387, Optical Pattern Recognition XII, (20 March 2001);


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