Phase-only optical encryption based on the zeroth-order phase-contrast technique

José Carlos Pizolato Jr.; Luiz G. Neto

doi:10.1117/1.3223629

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1 September 2009 Phase-only optical encryption based on the zeroth-order phase-contrast technique

José Carlos Pizolato Jr., Luiz G. Neto

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Optical Engineering, 48(9), 098201 (2009). https://doi.org/10.1117/1.3223629

Abstract

A phase-only encryption/decryption scheme with the readout based on the zeroth-order phase-contrast technique (ZOPCT), without the use of a phase-changing plate on the Fourier plane of an optical system based on the 4f optical correlator, is proposed. The encryption of a gray-level image is achieved by multiplying the phase distribution obtained directly from the gray-level image by a random phase distribution. The robustness of the encoding is assured by the nonlinearity intrinsic to the proposed phase-contrast method and the random phase distribution used in the encryption process. The experimental system has been implemented with liquid-crystal spatial modulators to generate phase-encrypted masks and a decrypting key. The advantage of this method is the easy scheme to recover the gray-level information from the decrypted phase-only mask applying the ZOPCT. An analysis of this decryption method was performed against brute force attacks.

©(2009) Society of Photo-Optical Instrumentation Engineers (SPIE)

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José Carlos Pizolato Jr. and Luiz G. Neto "Phase-only optical encryption based on the zeroth-order phase-contrast technique," Optical Engineering 48(9), 098201 (1 September 2009). https://doi.org/10.1117/1.3223629

Published: 1 September 2009

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