Optical Double Image Hiding in the Fractional Hartley Transform Using Structured Phase Filter and Arnold Transform

International Journal of Optics

2021

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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.

“…e SVD may be a numerical method utilized to diagonalizable matrices. It breaks down a m × m real matrix A into a product of three matrices as follows [69][70][71][72][73]:…”

Section: Singular Value Decomposition (Svd)mentioning

confidence: 99%

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

Sangwan

International Journal of Optics

2021

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“…In this work we have added gaussian noise to the encoded image. The noise interferes with the ciphered images by relation [53,54].…”

Section: Occlusion Attack Analysismentioning

confidence: 99%

Security-enrichment of an asymmetric optical image encryption-based devil’s vortex Fresnel lens phase mask and lower upper decomposition with partial pivoting in gyrator transform domain

Anshula

2021

Preprint

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An asymmetric optical cryptosystem to encrypt images using devil’s vortex Fresnel lens (DVFLs) phase masks and lower upper decomposition with partial pivoting (LUDPP) is proposed in gyrator transform domain. The proposed cryptosystem utilizes DVFLs which are the complex phase masks designed using the combination of a phases of devil’s lens (DL), vortex lens(VL), and Fresnel lens (FL). LUDPP is an operation used to decompose the matrix and is utilized to supersede the phase-truncation (PT) task in the traditional phase-truncated Fourier transform (PTFT). Hence, the proposed method is immune to the attacks to which the PTFT-based cryptosystems are vulnerable. The cryptosystem is asymmetric as both the encryption and decryption processes are different along with different keys. The private keys generated during the encryption process are utilised in the decryption process to retrieve the original image. The encryption and decryption process can be realised with both the digital and the modified optical architecture. In order to show the strength and robustness of the proposed encryption, a conspire numerical simulation was performed.

“…Figure 9 shows the CPA analysis of DRPE system. The proposed system has been checked with sensitivity analysis [52][53][54][55] . It means, how much the system is sensitive even there is a small difference.…”

Section: 2noise Attack Analysismentioning

confidence: 99%

“…Occlusion is defined as hiding some portions or overwriting throughout communication. To examine the robustness of an encrypted data, occlusion attack [52][53][54][55] has been preferred for this cryptosystem.…”

Section: 1occlusion Attack Analysismentioning

confidence: 99%

Cryptanalysis of DRPE Using Complex S-Box Based on Linear Canonical Transform

Girija

Abirami

2021

Preprint

During recent decades, double random phase encoding grasped more attention for researchers. To achieve nonlinearity, it had been done with random S-Box. We exhibit this involvement that DRPE system is much vulnerable in the above methodology. Concatenating anything with DRPE needs an imaginary value, wherein s-box unsuccessful in it. Used S-box has been reformed into various sizes. Due to this scenario, S-box values are replicating. So, complex S-box has been employed and proposed size of the s-box is similar to an input image. Numerical simulations have been performed out to validate the practicability and trustworthiness of traditional DRPE system with complex S-box.