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Proceedings Paper

Optical visual cryptography based on the phase characteristics of spatial light modulator
Author(s): Sang-Yi Yi; Chung-Sang Ryu; Seung-Hyun Lee
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Paper 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.

Paper Details

Date Published: 28 September 2006
PDF: 9 pages
Proc. SPIE 6402, Optics and Photonics for Counterterrorism and Crime Fighting II, 64020A (28 September 2006); doi: 10.1117/12.689483
Show Author Affiliations
Sang-Yi Yi, National Security Research Institute (South Korea)
Chung-Sang Ryu, Ministry of Information and Communication (South Korea)
Seung-Hyun Lee, Kwangwoon Univ. (South Korea)


Published in SPIE Proceedings Vol. 6402:
Optics and Photonics for Counterterrorism and Crime Fighting II
Colin Lewis; Gari P. Owen, Editor(s)

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