Optical visual cryptography based on the phase characteristics of spatial light modulator

Sang-Yi Yi; Chung-Sang Ryu; Seung-Hyun Lee

doi:10.1117/12.689483

28 September 2006 Optical visual cryptography based on the phase characteristics of spatial light modulator

Sang-Yi Yi, Chung-Sang Ryu, Seung-Hyun Lee

Proceedings Volume 6402, Optics and Photonics for Counterterrorism and Crime Fighting II; 64020A (2006) https://doi.org/10.1117/12.689483
Event: Optics/Photonics in Security and Defence, 2006, Stockholm, Sweden

Abstract

Optical visual cryptography based on binary computer generated hologram (BCGH) was proposed which used optics instead of human eyesight for decryption. As a result, it was possible to adapt cryptography to optical system. However, it also had some difficulties because it did not overcome the existing problem of visual cryptography completely. This paper suggested the method of optical cryptography implementation based on the phase modulation characteristics of liquid crystal display (LCD). The problems and appropriations are evaluated with some simulation. This system showed that the noise was reduced and resolution was improved compare with the conventional optical visual cryptography.

Citation Download Citation

Sang-Yi Yi, Chung-Sang Ryu, and Seung-Hyun Lee "Optical visual cryptography based on the phase characteristics of spatial light modulator", Proc. SPIE 6402, Optics and Photonics for Counterterrorism and Crime Fighting II, 64020A (28 September 2006); https://doi.org/10.1117/12.689483

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