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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Phase-only decryption by use of a single spatial light modulator

Tien Viet Vu, Nam Kim, Jun-Won An, Sang‐Keun Gil

Published Aug 1, 2007• 0 citations
Publisher

Abstract

We propose an experimental demonstration for the phase-only optical decryption based on kinogram encoding. Only one spatial light modulator is used to simultaneously display the encrypted information and the decrypting key for decryption. We investigate the effect of binary and multiphase keys on the security level of the encrypted information. The accepted displacement of the decryption key within the system is also determined. The free misalignment of the Fourier lens is experimentally demonstrated.

DOI
10.1109/cleopr.2007.4391678

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We propose an experimental demonstration for the phase-only optical decryption based on kinogram encoding. Only one spatial light modulator is used to simultaneously display the encrypted information and the decrypting key for decryption. We investigate the effect of binary and multiphase keys on the security level of the encrypted information. The accepted displacement of the decryption key within the system is also determined. The free misalignment of the Fourier lens is experimentally demonstrated.
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Our goal is to enhance the security level of a Fourier optical encryption system. Therefore we propose a Mach–Zehnder interferometer based encryption setup. The input data is organized in a binary array, and it is encoded in the two wave fronts propagated in the arms of the interferometer. Both input wave fronts are independently encrypted by Fourier systems, hence the proposed method has two encryption keys. During decryption, the encrypted wave fronts are propagated through the interferometer setup. The interference pattern of the output shows the reconstructed data in cases where the correct decryption Fourier keys are used. We propose a novel input image modulation method with a user defined phase parameter. We show that the security level of the proposed cryptosystem can be enhanced by an optimally chosen phase parameter.
Abstract We present the implementation of an experimental optical encryption configuration in the Fresnel domain using the thermal lens (TL) effect to modulate the phase of the illumination beam. We corroborate the basic performance of our cryptosystem by performing the encryption-decryption procedure of a single object. Then, we test the tolerance of the proposed scheme to decryption with keys registered for different modulations of the illumination beam induced by the phase generated due to TL effect. These different phase modulations are obtained by introducing axial displacements of a sample, where the TL effect is induced by an excitation beam (EB). Considering the phase modulation changes in the illumination due to sample displacements, we propose an undercover procedure to further protect the target information using decoy data. The key associated with the target information is obtained when the probe beam (PB) and EB are focused on the same point of the sample, while the decoy object key is registered when the beams are not focused on the same region of the sample. Finally, we analyzed the resistance of the undercover ciphertext to some of the attacks reported in the literature. All experimental results presented in this work demonstrate the basic capabilities, viability, and versatility of our proposals.
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.
A new scheme for parallel optical decryption and the display of encrypted image information is presented. The scheme is based on a common path interferometer configuration providing a simple and robust optical setup. Images are encrypted directly during recording by use of a combined phase encoding and phase scrambling method. The encoding and encryption does not require sophisticated, iterative and time consuming optimization algorithms. Pixels are independently encoded and encrypted by use of a simple look-up table technique that can be performed in milliseconds on a standard personal computer. Optical decryption can subsequently be implemented in the common path interferometer by use of single phase or if desired a combined phase/amplitude key. An advantage of the presented method is that the encrypted image may selectively require recording and decryption of phase values or amplitude values or a combination thereof. Another advantage is that decryption is performed in a plane adjacent to the encrypted mask or an equivalent plane whereby generation of speckles in the decrypted image is strongly suppressed. Finally, there is no requirement of positioning a decrypting mask or spatial light modulator in the optical Fourier plane whereby an accurate three dimensional positioning requirement can be avoided.