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ACTA PHOTONICA SINICA

Interference-based Multiple-image Encryption by Position and Wavelength Multiplexing

秦怡 Qin Yi, 刘旭焱 LIU Xu-yan, 巩琼 Gong Qiong

Published Jan 1, 2014• 0 citations
Publisher

Abstract

A novel interference-based multiple-image encryption method with high encryption capacity was proposed by position and wavelength multiplexing.For encryption,the original images to be encrypted were divided into two groups,and each group of target images was analytically hidden into two phase only masks by position multiplexing.Subsequently the obtained four phase only masks were further merged into two diffractive phase elements by wavelength multiplexing.The encryption process did not need iterative algorithm and should be implemented digitally,while the decryption process could be performed both digitally and optically.The encryption capacity of the system was evaluated with correlation coefficient,and it was shown that the capacity was greatly improved due to the introduction of both position and wavelength multiplexing.In addition,the robustness of the proposal against noise and occlusion was also investigated,and the results indicated that the proposal is of high robust against noise attack but a little vulnerable to occlusion attack.

DOI
10.3788/gzxb20144303.0310004

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A novel interference-based multiple-image encryption method with high encryption capacity was proposed by position and wavelength multiplexing.For encryption,the original images to be encrypted were divided into two groups,and each group of target images was analytically hidden into two phase only masks by position multiplexing.Subsequently the obtained four phase only masks were further merged into two diffractive phase elements by wavelength multiplexing.The encryption process did not need iterative algorithm and should be implemented digitally,while the decryption process could be performed both digitally and optically.The encryption capacity of the system was evaluated with correlation coefficient,and it was shown that the capacity was greatly improved due to the introduction of both position and wavelength multiplexing.In addition,the robustness of the proposal against noise and occlusion was also investigated,and the results indicated that the proposal is of high robust against noise attack but a little vulnerable to occlusion attack.
In this paper, an improved multiple-image authentication based on optical interference by wavelength multiplexing is proposed, which has high security and easy optical implementation. The Fresnel spectra of original images are diffracted from the same axial position but by different wavelengths, which makes the optical implementation easy and stable without any mechanical translation. Then, the Fresnel spectra are sparsely sampled by predesigned binary amplitude masks and diffracted again, and all spectra are multiplexed into one synthetized spectrum. Finally, the synthetized spectrum is analytically decomposed into one phase-only mask and one amplitude-only mask by an improved interference-based encryption (IBE) scheme. Benefiting from the wavelength multiplexing, the encryption capacity is enlarged, and the optical implementation for decryption becomes easy. With the aid of the sparse sampling, every decrypted image could be entirely unrecognizable but authenticated by nonlinear correlation. Moreover, instead of a conventional IBE, an improved IBE is used in this scheme, which can attenuate the information leakage and further enhance the security. Various numerical simulation results are presented to demonstrate the feasibility and effectiveness of this scheme.
We report a novel optical method of interference-based multiple-image encryption and authentication via lateral shift multiplexing and sparsification. We encode multiple original images into two ciphertexts only containing partial information of the multiple images when the secret key generated randomly is laterally movable within a predefined interval, and we analytically derive the two other keys of each original image. Information discrimination for each original image as well as its silhouette is still prohibited in spite of the utilization of one, two, three, or even four masks for decryption. The three secret keys of each original image significantly improve the security of the proposed method, and binary amplitude masks are included in the decryption and authentication procedure. Moreover, the proposed scheme completely eliminates the cross-talk problem and destroys any high correlation between the plaintexts and ciphertexts. Numerical simulations are executed to prove the effectiveness and security of this scheme.
In this paper, we propose an asymmetric double-image encryption via wavelength multiplexing. First, a novel iterative phase retrieval algorithm, to the best of our knowledge, is developed to encode two images into one complex-valued function via wavelength multiplexing. Then, the function is encoded by equal modulus decomposition (EMD). This cryptosystem not only retains the advantages of EMD but also reduces the number of public keys so as to enhance the resistance to the amplitude-phase retrieval algorithm (APRA). In the decryption, two high-quality decrypted images can be obtained with their corresponding wavelengths. To the best of our knowledge, this is the first time that wavelength multiplexing is used to achieve high-quality two-image encryption and decryption. Numerical simulation results show the effectiveness and robustness of this new method.
A novel optical encryption system based on non coherent superposition is proposed. In this system, the original image is hidden into three Phase Only Masks (POMs). One of the phase masks is generated by computer while another two are obtained analytically. For decryption, the diffraction filed of the three POMs is superposed by utilizing the beam splitters. The intensity of the superposition field, which is exactly the original image, could be recorded by CCD camera. Compared with the earlier interference-based method, our approach is simple and easy to be realized by optical elements. Moreover, the silhouette problem existing in the earlier method with two POMs can be resolved in our method, thus the security of the method is further improved. Simulation results are presented to verify the validity of the proposed approach.
We propose an image encryption system based on phase mask multiplexing and photon counting imaging (PCI) technique for multiple image authentications and digital hologram security. Multiple images to be authenticated are converted into phase-only images using a phase-retrieval algorithm in fractional Fourier transform domain. The multiple phase-only images are multiplexed into a single phase-only mask and it is further encrypted into a complex-valued function. The photon-limited image is generated by applying the PCI technique to a complex-valued function. For decryption, the photon-limited decrypted images are obtained after applying the appropriate keys. The photon-limited decrypted image contains sufficient information for verification because this image has sparse representation. To verify the photon-limited decrypted image, the optical correlation filters can be used. The proposed system has also been used for hologram security. For hologram security, the system provides multiple layers of security by hiding multiple encrypted images. The computer simulation results have been presented. The authentication scheme has been tested for securing three-dimensional information through experimentally recorded Fresnel digital hologram.
Multiple image encryption (MIE) was proposed to increase the efficiency of encrypting images by processing several images simultaneously. Because of the advantage of optical technology in processing twodimensional images at high throughput, MIE has been significantly improved by use of methods originating from optics. Phase retrieval was the process of algorithmically finding solutions to the phase loss problem due to light detectors only capturing the intensity. It was to retrieve phase information for the determination of a structure from diffraction data. Error-reduction algorithm is a typical phase retrieval method. Here, we employ it to illustrate that methods in phase retrieval are able to encrypt multiple images and compress them into encrypted data simultaneously. Moreover, the decryption is also designed to handle multiple images at the same time. The whole process including both the encryption and decryption is proposed to improve MIE with respect to the compression and efficiency. The feasibility and encryption of the MIE scheme is demonstrated with encryption experiments under Gaussian white noise and unauthorized access.