Journal ArticleDOI
Optical encryption by double-random phase encoding in the fractional Fourier domain.
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TLDR
An optical architecture that encodes a primary image to stationary white noise by using two statistically independent random phase codes that has an enhanced security value compared with earlier methods is proposed.Abstract:
We propose an optical architecture that encodes a primary image to stationary white noise by using two statistically independent random phase codes. The encoding is done in the fractional Fourier domain. The optical distribution in any two planes of a quadratic phase system (QPS) are related by fractional Fourier transform of the appropriately scaled distribution in the two input planes. Thus a QPS offers a continuum of planes in which encoding can be done. The six parameters that characterize the QPS in addition to the random phase codes form the key to the encrypted image. The proposed method has an enhanced security value compared with earlier methods. Experimental results in support of the proposed idea are presented.read more
Citations
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Journal ArticleDOI
Double random-phase encoding in the Fresnel domain
Guohai Situ,Jingjuan Zhang +1 more
TL;DR: A lensless optical security system based on double random-phase encoding in the Fresnel domain is proposed, which can encrypt a primary image to random noise by use of two statistically independent random- phase masks in the input and transform planes, respectively.
Journal ArticleDOI
Optical image compression and encryption methods
Ayman Alfalou,Christian Brosseau +1 more
TL;DR: Optical processing methodologies, based on filtering, are described that are applicable to transmission and/or data storage and the advantages and limitations of a set of optical compression and encryption methods are discussed.
Journal ArticleDOI
Resistance of the double random phase encryption against various attacks
TL;DR: A technique to recover the exact keys with only two known plain images is described, and this technique is compared to other attacks proposed in the literature.
Journal ArticleDOI
Advances in optical security systems
TL;DR: This paper presents a review of optical technologies for information security, and theoretical principles and implementation examples are presented to illustrate each optical security system.
Journal ArticleDOI
Two-step phase-shifting interferometry and its application in image encryption.
TL;DR: A novel algorithm of two-step PSI, with an arbitrary known phase step, by which a complex object field can be reconstructed with only two interferograms is proposed and is applied to an information security system based on double random-phase encoding in the Fresnel domain.
References
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Journal ArticleDOI
Optical image encryption based on input plane and Fourier plane random encoding.
Philippe Réfrégier,Bahram Javidi +1 more
TL;DR: A new optical encoding method of images for security applications is proposed and it is shown that the encoding converts the input signal to stationary white noise and that the reconstruction method is robust.
Journal ArticleDOI
Encrypted optical memory system using three-dimensional keys in the Fresnel domain.
Osamu Matoba,Bahram Javidi +1 more
TL;DR: Encryption and decryption of optical memory in a LiNbO(3) :Fe photorefractive crystal by use of angular multiplexing is demonstrated.
Journal ArticleDOI
Optical encryption system that uses phase conjugation in a photorefractive crystal.
TL;DR: In this work, an optical encryption system based on double-random phase encoding of the data at the input and the Fourier planes is implemented, and the key that is used during encryption can be used for decrypting the data, thereby alleviating the need for using a conjugate of the key.
Journal ArticleDOI
Encrypted optical storage with angular multiplexing
Osamu Matoba,Bahram Javidi +1 more
TL;DR: The encryption and the decryption of multiple frames of two-dimensional digital data by using angular multiplexing are demonstrated and the influence of the bandwidth of the optical system on the decrypted digital data is evaluated.
Journal ArticleDOI
Encrypted optical storage with wavelength-key and random phase codes
Osamu Matoba,Bahram Javidi +1 more
TL;DR: An encrypted optical memory system that uses a wavelength code as well as input and Fourier-plane random phase codes is proposed and it is shown that the number of available wavelength keys depends on the correlation length of the phase key in the Fourier plane.
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