20 February 2007 Optical encryption of binary data information with 2-step phase-shifting digital holography
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Proceedings Volume 6488, Practical Holography XXI: Materials and Applications; 648812 (2007); doi: 10.1117/12.699921
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States
Abstract
We propose an optical encryption/decryption technique based on 2-step phase-shifting digital holography for a cipher system. The technique using 2-step phase-shifting digital holography is more efficient than 4-step phase-shifting digital holography because the 2-step method has less data than 4-step method to restore or transmit the encrypted data. In our system, 2-step phase-shifting digital holograms are acquired by moving the PZT mirror with phase step of 0 or &pgr;/2 in the reference beam path and are recorded on CCD camera. The information data and the key are expressed with random binary amplitude and random phase. Digital hologram in this method is Fourier transform hologram and digitized with 256 gray-level. DC-term removal is essential to reconstruct and decrypt the original binary data information. The simulation shows that the proposed method gives good results for cipher system. The quantization error is also analyzed.
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Sang Keun Gil, Hyun Joong Byun, Hyun Jin Lee, Seok Hee Jeon, Jong Rae Jeong, "Optical encryption of binary data information with 2-step phase-shifting digital holography", Proc. SPIE 6488, Practical Holography XXI: Materials and Applications, 648812 (20 February 2007); doi: 10.1117/12.699921; http://dx.doi.org/10.1117/12.699921
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KEYWORDS
Digital holography

Binary data

Phase shifts

Holograms

Fourier transforms

Holography

CCD cameras

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