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 π/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.
© 2012 Optical Society of Korea
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(090.0090) Holography : Holography
(090.2880) Holography : Holographic interferometry
(170.3010) Medical optics and biotechnology : Image reconstruction techniques
(200.4560) Optics in computing : Optical data processing
Original Manuscript: July 31, 2012
Revised Manuscript: August 30, 2012
Manuscript Accepted: September 3, 2012
Published: September 25, 2012
Seok-Hee Jeon and Sang-Keun Gil, "Dual Optical Encryption for Binary Data and Secret Key Using Phase-shifting Digital Holography," J. Opt. Soc. Korea 16, 263-269 (2012)
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