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
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
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