scholarly journals Design and analysis of pseudo hadamard transformation and non-chaotic substitution based image encryption scheme

2019 ◽  
Vol 15 (3) ◽  
pp. 1297 ◽  
Author(s):  
Prajwalasimha S N ◽  
Kavya S R ◽  
Tanaaz Zeba Ahmed
Keyword(s):  
Image Encryption ◽  
Experimental Analysis ◽  
Standard Test ◽  
Cyber Attacks ◽  
Encryption Scheme ◽  
Intrinsic Properties ◽  
Two Stage ◽  
Hadamard Transformation ◽  
Pixel Value ◽  
Changing Rate

In this paper, Pseudo Hadamard Transformation (PHT) and non-chaotic substitution based image encryption scheme has been proposed. Images are characterized by intrinsic properties such as, strong redundancy and correlation between the adjacent pixels, hence more vulnerable to cyber-attacks. In the proposed technique, the redundancy and correlation have been effectively reduced by pixel position transformation using PHT and pixel value variation using non chaotic substitution, providing two stage security in encryption for images. Fifteen standard test images are considered for experimental analysis. Better average Number of Pixel Changing Rate (NPCR) and Unified Average pixel Changing Intensity (UACI) are obtained for a set of standard test images compared to more popular existing algorithms.

scholarly journals Design and Implementation of Transformation and Non-Chaotic Substitution Based Image Cryptosystem

2019 ◽  
Vol 8 (6) ◽  
pp. 1079-1083 ◽  
Keyword(s):  
Image Encryption ◽  
Standard Test ◽  
Cyber Attacks ◽  
Encryption Scheme ◽  
Intrinsic Properties ◽  
Design And Implementation ◽  
Hadamard Transformation ◽  
Pixel Value ◽  
Image Cryptosystem ◽  
Changing Rate

In this article, a Modified Pseudo Hadamard Transformation (MPHT) and non-Chaotic substitution based image encryption scheme has been proposed. Due to intrinsic properties such as, strong redundancy and correlation between the adjacent pixels, images are more vulnerable to cyber-attacks. In the proposed technique, the redundancy and correlation have been effectively reduced by pixel position transformation using MPHT and pixel value variation using non chaotic substitution, providing two stage security in encryption for secrete images. An average 99.6089% of Number of Pixel Changing Rate (NPCR) and 33.4328% of Unified Average pixel Changing Intensity (UACI) are obtained for a set of standard test images compared to more popular existing techniques

Optimal concurrency on FPGA for lightweight medical image encryption

2021 ◽  
pp. 1-16
Author(s):  
Vinoth Raj ◽  
Siva Janakiraman ◽  
Rengarajan Amirtharajan
Keyword(s):  
Resource Utilization ◽  
Image Encryption ◽  
Medical Image ◽  
Medical Diagnostics ◽  
Standard Test ◽  
Optimal Number ◽  
Linear Feedback ◽  
Encryption Scheme ◽  
Low Power Dissipation ◽  
Health Care Applications

Digitized forms of images do widely used for medical diagnostics. To maintain the privacy of an individual in e-health care applications, securing the medical image becomes essential. Hence exclusive encryption algorithms have been developed to protect the confidentiality of medical images. As an alternative to software implementations, the realization of image encryption architectures on hardware platforms such as FPGA offers significant benefit with its reconfigurable feature. This paper presents a lightweight image encryption scheme for medical image security feasible to realize as concurrent architectural blocks on reconfigurable hardware like FPGA to achieve higher throughput. In the proposed encryption scheme, Lorentz attractor’s chaotic keys perform the diffusion process. Simultaneously, the pseudo-random memory addresses obtained from a Linear Feedback Shift Register (LFSR) circuit accomplishes the confusion process. The proposed algorithm implemented on Intel Cyclone IV FPGA (EP4CE115F29C7) analyzed the optimal number of concurrent blocks to achieve a tradeoff among throughput and resource utilization. Security analyses such as information entropy, histogram, correlation, and PSNR confirms the algorithm’s encryption quality. The strength of diffusion keys was ensured by randomness verification through the standard test suite from the National Institute of Standards and Technology (NIST). The proposed scheme has a larger keyspace of 2384 that guarantees good confusion through near-zero correlation, and successful diffusion with a PSNR of <5 dB towards the statistical attacks. Based on the hardware analysis, the optimal number of concurrent architectural blocks (2 N) on the chosen FPGA to achieve higher throughput (639.37 Mbps), low power dissipation (138.85 mW), minimal resource utilization (1268 Logic Elements) and better encryption quality for the proposed algorithm is recommended as 4 (with N = 2).

A Secure Image Encryption Scheme using Chaos and Wavelet Transformations

2018 ◽  
Vol 12 (1) ◽  
pp. 5-14 ◽  
Author(s):  
Bhaskar Mondal ◽  
Tarni Mandal ◽  
Danish Ali Khan ◽  
Tanupriya Choudhury
Keyword(s):  
Image Encryption ◽  
Encryption Scheme ◽  
Wavelet Transformations

scholarly journals Hyperchaotic Image Encryption Based on Multiple Bit Permutation and Diffusion

Entropy ◽  
2021 ◽  
Vol 23 (5) ◽  
pp. 510
Author(s):  
Taiyong Li ◽  
Duzhong Zhang
Keyword(s):  
Big Data ◽  
Lyapunov Exponents ◽  
Image Encryption ◽  
Hyperchaotic System ◽  
Encryption Scheme ◽  
Image Content ◽  
Image Security ◽  
Level Data ◽  
Different Types ◽  
And Diffusion

Image security is a hot topic in the era of Internet and big data. Hyperchaotic image encryption, which can effectively prevent unauthorized users from accessing image content, has become more and more popular in the community of image security. In general, such approaches conduct encryption on pixel-level, bit-level, DNA-level data or their combinations, lacking diversity of processed data levels and limiting security. This paper proposes a novel hyperchaotic image encryption scheme via multiple bit permutation and diffusion, namely MBPD, to cope with this issue. Specifically, a four-dimensional hyperchaotic system with three positive Lyapunov exponents is firstly proposed. Second, a hyperchaotic sequence is generated from the proposed hyperchaotic system for consequent encryption operations. Third, multiple bit permutation and diffusion (permutation and/or diffusion can be conducted with 1–8 or more bits) determined by the hyperchaotic sequence is designed. Finally, the proposed MBPD is applied to image encryption. We conduct extensive experiments on a couple of public test images to validate the proposed MBPD. The results verify that the MBPD can effectively resist different types of attacks and has better performance than the compared popular encryption methods.

A novel image encryption scheme based on non-adjacent parallelable permutation and dynamic DNA-level two-way diffusion

2021 ◽  
Vol 61 ◽  
pp. 102844
Author(s):  
Hongmin Li ◽  
Tie Li ◽  
Wei Feng ◽  
Jing Zhang ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Image Encryption ◽  
Encryption Scheme
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