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Proceedings Paper

Optical encryption of binary data information with 2-step phase-shifting digital holography
Author(s): Sang Keun Gil; Hyun Joong Byun; Hyun Jin Lee; Seok Hee Jeon; Jong Rae Jeong
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Paper 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.

Paper Details

Date Published: 20 February 2007
PDF: 9 pages
Proc. SPIE 6488, Practical Holography XXI: Materials and Applications, 648812 (20 February 2007); doi: 10.1117/12.699921
Show Author Affiliations
Sang Keun Gil, The Univ. of Suwon (South Korea)
Hyun Joong Byun, The Univ. of Suwon (South Korea)
Hyun Jin Lee, The Univ. of Suwon (South Korea)
Seok Hee Jeon, The Univ. of Incheon (South Korea)
Jong Rae Jeong, Suwon Science College (South Korea)

Published in SPIE Proceedings Vol. 6488:
Practical Holography XXI: Materials and Applications
Roger A. Lessard; Hans I. Bjelkhagen, Editor(s)

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