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

José Carlos Pizolato; Luiz G. Neto

doi: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.

Citation Download Citation

José Carlos Pizolato, José Carlos Pizolato, Luiz G. Neto, 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 . Submission:

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