An Asymmetric Image Encryption Based on Phase Truncated Hybrid Transform

A new asymmetric optical double image encryption algorithm is proposed, which combines phase truncation and singular value decomposition. The plain text is encrypted with two-stage phase keys to obtain a uniformly distributed cipher text and two new decryption keys. These keys are generated during the encryption process and are different from encryption keys. It realizes asymmetric encryption and improves the security of the system. The unscrambling keys in the encryption operation are mainly related to plain text. At the same time, the system is more resistant to selective plain text attacks; it also improves the sensitivity of decryption keys. With the application of phase truncation, the key space expanded and the security of the cryptographic system is enhanced. The efficacy of the system is calculated by evaluating the estimated error between the input and retrieved images. The proposed technique provides innumerable security keys and is robust against various potential attacks. Numerical simulations verify the effectiveness and security of the proposed technique.

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“…But still, the recovered images are visible till 25%. Figure 11(a e noise interferes with the ciphered images by relation [80][81][82].…”

Section: Robustness Methods Against Pixels Croppedmentioning

confidence: 99%

A Secure Asymmetric Optical Image Encryption Based on Phase Truncation and Singular Value Decomposition in Linear Canonical Transform Domain

Sangwan

Singh

2021

International Journal of Optics

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“…The entropy H(s) of a message source can be mathematically calculated and written [46][47][48][49] as (16) where s i is the ith image value for L level greyscale image P s i that represents the probability of the symbol s i . ∑ i = 0 L P s i = 1.…”

Section: Entropy Analysismentioning

confidence: 99%

“…To check the strength of the proposed scheme it has been tested against the noise attack by considering multiplicative Gaussian noise in the encrypted images. The interference of multiplicative noise interferes in the encrypted images can be presented through the following relation [45][46][47][48][49]: where δ and δ′ are the encrypted and the noise-affected encrypted amplitude images, respectively, k is a noise factor coefficient which represents the noise strength and G is Gaussian random noise with zero-mean and unit standard deviation. Fig.…”

Section: Noise Attack Analysismentioning

confidence: 99%

Watermarking image encryption using deterministic phase mask and singular value decomposition in fractional Mellin transform domain

Singh

2018

IET Image Processing

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“…Asymmetric technique consists of different keys while encryption and decryption of an image and it helps in maintaining the strength of the system. Therefore, many nonlinear encryption methods [28][29][30][31][32][33] have been further suggested. The proposed work deals with enhancing the security of the original DRPE by introducing a rear phase mask operation using random decomposition which helps in adding more security by enhancing the key space.…”

Section: Introductionmentioning

confidence: 99%

Image encryption algorithm based on rear-mountedphase mask and random decomposition

Yadav¹,

Singh²

2022

Optica Applicata

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To escalate the image encryption a new method has been devised which includes double random phase encoding (DRPE) using rear phase masking and random decomposition (RD) technique stranded on fractional Fourier transform. Here, asymmetric cryptographic system is developed in fractional Fourier transform (FrFT) mode using two random phase masks (RPM) and a rear mounted phase mask. In the projected scheme a colored image is decomposed into R, G and B channels. The amplitude of each channel is normalized, phase encoded and modulated using RPM. The modulated R, G and B channels of the colored image are individually transformed using FrFT to produce corresponding encrypted image. The proposed scheme is authorized on grayscale image also. The norm behind the development of the suggested scheme has been elaborated by carrying out cryptanalysis on system based on the RD. The method helps in escalations of the protection of double random phase encoding by cumulating the key length and the parameter amount, so that it vigorously can be used against various attacks. The forte of the suggested cryptographic system was verified using simulations with MATLAB 7.9.0 (R2008a). The efficiency of the suggested scheme includes the analysis using singular value decomposition (SVD), histogram and correlation coefficient.

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An Asymmetric Image Encryption Based on Phase Truncated Hybrid Transform

Cited by 23 publications

References 45 publications

A Secure Asymmetric Optical Image Encryption Based on Phase Truncation and Singular Value Decomposition in Linear Canonical Transform Domain

A Secure Asymmetric Optical Image Encryption Based on Phase Truncation and Singular Value Decomposition in Linear Canonical Transform Domain

Watermarking image encryption using deterministic phase mask and singular value decomposition in fractional Mellin transform domain

Image encryption algorithm based on rear-mountedphase mask and random decomposition

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