Optical implementation of image encryption using random phase mask and speckle-free phase Fresnel hologram

1997 ◽  
Author(s):  
Luiz G. Neto ◽  
Yunlong Sheng
Keyword(s):  
Image Encryption ◽  
Random Phase ◽  
Phase Mask ◽  
Fresnel Hologram

Image Encryption Based on Vector Decomposition and Chaotic Random Phase Mask

2020 ◽  
Vol 57 (4) ◽  
pp. 041002
Author(s):  
陶珊 Tao Shan ◽  
唐晨 Tang Chen ◽  
雷振坤 Lei Zhenkun
Keyword(s):  
Image Encryption ◽  
Random Phase ◽  
Phase Mask ◽  
Vector Decomposition

A No Interference Optical Image Encryption by a Fresnel Diffraction and a Fourier Transformation

2012 ◽  
Vol 459 ◽  
pp. 461-464
Author(s):  
Huai Sheng Wang
Keyword(s):  
Image Encryption ◽  
Digital Image ◽  
Fourier Transformation ◽  
Random Phase ◽  
Fresnel Diffraction ◽  
Optical Image ◽  
Phase Mask ◽  
Phase Plate ◽  
Encrypted Image ◽  
Optical Image Encryption

A no interference optical image encryption is put forward in this paper. The encrypting process is composed of a Fresnel diffraction and a Fourier transformation. A digital image coded with a random phase plate first takes a Fresnel diffraction. The diffraction function is enlarged and coded with another random phase mask. At last the enlarged function undergoes a Fourier transformation. The real part of the transformed function is defined as an encrypted image. In decrypting process, first the encrypted image takes an inverse Fourier transformation. Then the upper left corner of the transformed function is intercepted. According to the space inversion of the transformed function, if the intercepted function takes an inverse Fresnel diffraction, the original digital image can be restored from the final diffraction function. Because there is no interference process in encryption and decryption, the optical system is relatively simple and the quality of restored image is very good

scholarly journals Optical Image Encryption Using Devil’s Vortex Toroidal Lens in the Fresnel Transform Domain

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Hukum Singh ◽  
A. K. Yadav ◽  
Sunanda Vashisth ◽  
Kehar Singh
Keyword(s):  
Image Encryption ◽  
Mean Squared Error ◽  
Random Phase ◽  
Optical Image ◽  
Phase Mask ◽  
Digital Implementation ◽  
Key Space ◽  
Fresnel Transform ◽  
Encrypted Images ◽  
Optical Image Encryption

We have carried out a study of optical image encryption in the Fresnel transform (FrT) domain, using a random phase mask (RPM) in the input plane and a phase mask based on devil’s vortex toroidal lens (DVTL) in the frequency plane. The original images are recovered from their corresponding encrypted images by using the correct parameters of theFrTand the parameters of DVTL. The use of a DVTL-based structured mask enhances security by increasing the key space for encryption and also aids in overcoming the problem of axis alignment associated with an optical setup. The proposed encryption scheme is a lensless optical system and its digital implementation has been performed using MATLAB 7.6.0 (R2008a). The scheme has been validated for a grayscale and a binary image. The efficacy of the proposed scheme is verified by computing mean-squared-error (MSE) between the recovered and the original images. We have also investigated the scheme’s sensitivity to the encryption parameters and examined its robustness against occlusion and noise attacks.

System for Optical Multiple Binary Image Encryption by Random Phase Mask Multiplexing

2014 ◽  
Vol 34 (3) ◽  
pp. 0307001
Author(s):  
秦怡 Qin Yi ◽  
李婧 Li Jing ◽  
马毛粉 Ma Maofen ◽  
吕晓东 Lü Xiaodong
Keyword(s):  
Image Encryption ◽  
Random Phase ◽  
Binary Image ◽  
Phase Mask

An Asymmetric Optical Cryptosystem of Double Image Encryption Based on Optical Vortex Phase Mask Using Gyrator Transform Domain

2020 ◽  
Vol 13 (4) ◽  
pp. 672-685
Author(s):  
Hukum Singh ◽  
Mehak Khurana
Keyword(s):  
Image Encryption ◽  
Random Phase ◽  
Optical Vortex ◽  
Phase Mask ◽  
Double Random Phase Encoding ◽  
Random Phase Encoding ◽  
Key Space ◽  
Gyrator Transform ◽  
Root Operation ◽  
Phase Truncation

Background: Optical Vortex (OV) has attracted attention amongst many researchers. Paper proposes a nonlinear scheme of image encryption based on Optical Vortex (OV) and Double Random Phase Encoding (DRPE) in the Gyrator Transform (GT) domain under phase truncation operations. Objective: The amplitude and phase truncation operation in the image encryption generates two decryption keys and convert the method to nonlinear. It has also been proposed opto-electronically. Original image can only be decrypted with correct values of OV, GT rotation angles and Decryption Keys (DKs). Methods: A novel asymmetric image encryption scheme, using optical vortex mask has been proposed in view of amplitude and phase truncation operation. The scheme becomes more strengthened by the parameters used in the Optical Vortex (OV) and by taking the (n)th power operation in the encryption path and (n)th root operation in the decryption path. Results: It shows that for each of the encryption parameters, binary image has greater sensitivity as compared to the grayscale image. This scheme inflates the security by making use of OV-based Structured Phase Mask (SPM) as it expands the key space. The scheme has also been investigated for its robustness and its sensitivity against various attacks such as noise and occlusion attacks under number of iterations. Conclusion: This scheme provides solution to the problem of key space with the use of GT rotational angles and OV phase mask thus enhances the security. The scheme has been verified based on various security parameters such as occlusion, noise attacks, CC, entropy etc.

scholarly journals Color image encryption based on chaotic compressed sensing and two-dimensional fractional Fourier transform

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Xingyuan Wang ◽  
Yining Su
Keyword(s):  
Fourier Transform ◽  
Compressed Sensing ◽  
Image Encryption ◽  
Fractional Fourier Transform ◽  
Color Image ◽  
Random Phase ◽  
Phase Mask ◽  
Two Dimensional ◽  
Measurement Matrix ◽  
Color Image Encryption

Abstract Combining the advantages of structured random measurement matrix and chaotic structure, this paper introduces a color image encryption algorithm based on a structural chaotic measurement matrix and random phase mask. The Chebyshev chaotic sequence is used in the algorithm to generate the flip permutation matrix, the sampling subset and the chaotic cyclic matrix for constructing the structure perceptual matrix and the random phase mask. The original image is compressed and encrypted simultaneously by compressed sensing, and re-encrypted by two-dimensional fractional Fourier transform. Simulation experiments show the effectiveness and reliability of the algorithm.

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