Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Dual Optical Encryption for Binary Data and Secret Key Using Phase-shifting Digital Holography

  • Jeon, Seok Hee (Department of Electronic Engineering, The University of Incheon) ;
  • Gil, Sang Keun (Department of Electronic Engineering, The University of Suwon)
  • Received : 2012.07.31
  • Accepted : 2012.09.03
  • Published : 2012.09.25
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Abstract

In this paper, we propose a new dual optical encryption method for binary data and secret key based on 2-step phase-shifting digital holography for a cryptographic system. Schematically, the proposed optical setup contains two Mach-Zehnder type interferometers. The inner interferometer is used for encrypting the secret key with the common key, while the outer interferometer is used for encrypting the binary data with the same secret key. 2-step phase-shifting digital holograms, which result in the encrypted data, are acquired by moving the PZT mirror with phase step of 0 or ${\pi}/2$ in the reference beam path of the Mach-Zehnder type interferometer. The digital hologram with the encrypted information is a Fourier transform hologram and is recorded on CCD with 256 gray level quantized intensities. Computer experiments show the results to be encryption and decryption carried out with the proposed method. The decryption of binary secret key image and data image is performed successfully.

Keywords

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