Chaos Based Image Encryption Technique Research Articles

Novel chaos based cryptosystem using four-dimensional hyper chaotic map with efficient permutation and substitution techniques

In this paper, a competent hyper chaos-based image encryption technique is proposed. The cryptosystem uses a four-dimensional hyper chaotic map for implementing the secret key information. In terms of Lyapunov exponents, NIST test results and bifurcation diagrams, 4-D hyperchaotic system exhibits better dynamical behavior than lower dimensional chaotic systems. Also, 4-D map has superior hyperchaotic performance in views of ergodicity, complexity, and randomness behavior and is capable to generate an unpredictable keystream, which is highly suitable for encryption. Therefore, a novel image encryption algorithm using four-dimensional hyper chaotic system is proposed here. A novel method with sequence of mathematical operations is used for the secret key generation. Both the confusion and diffusion phases are implemented on the basis of this secrete random values with innovative designs. In permutation phase, keystream-based pixel level and bit level scrambling are performed to shuffle the image pixels effectively. Novel methods are implemented to accomplish pixel level scrambling with row and column shift operations. The bit level scrambling is also instigated with a novel cyclic rotation technique. Thus, the pixel level and bit level scrambling ensure higher security in the permutation process. In substitution phase, the keystream is XORed with scrambled images in an effective manner to obtain the final encrypted image. Various evaluation measures are used to access the safety and security of the proposed system. The evaluation result of the projected method with numerous other techniques shows the sovereignty and higher security of the planned technique. The keystreams are generated from the hyperchaotic Lorenz system using a novel approach, and its generation is completely independent of the original image. The algorithm has wider application prospects, including encryption of images in medical field and cloud environment.

Mayfly optimization with chaos-based image encryption technique for cloud computing environment

Cloud computing (CC) technologies become popular due to their characteristics of maximum availability, flexibility, and scalability. Despite the benefits of CC, security becomes a major challenging issue that can be resolved by the use of image encryption techniques. Numerous works have been carried out with several approaches, and effective models need to be designed to enhance secure image encryption algorithms. Recently, chaotic approaches have been available in various domains, such as design of cryptosystems and image encryption. Chaos-based methods utilize random chaos sequences for image encryption, which are highly secure and fast. In this view, this study introduces a unique mayfly optimization with chaos-based image encryption (MFO-CBIE) technique for CC environment. The major intention of the MFO-CBIE model is to accomplish security in the CC environment via encryption and key generation process. The proposed MFO-CBIE model follows a three-stage process, namely image encryption, optimal key generation, and image decryption. In addition, the MFO-CBIE model employs the MFO algorithm for the optimal key generation process of the chaos-based encryption technique. Once the images are encrypted, they are securely transmitted to the cloud server. On the receiver side, the cipher image gets accessed from the cloud server, and then the decryption process is carried out. The experimental evaluation of the MFO-CBIE model is tested using benchmark images, and the results ensured the promising performance of the MFO-CBIE model over recent approaches.

A Review of Performance Comparison on Chaos Based Image Encryption Technique

A Review of Performance Comparison on Chaos Based Image Encryption Technique

Chaos based image encryption security in cloud computing

In the rapid world of technology, the IT Industry is growing at a rapid speed with Cloud Image Security. In the developing trends, cloud orchestration is becoming impressive and uncertain of dealing a large amount of information. In the last two decades there has been extensive development in image encryption. Chaos based image encryption techniques form framework for a faster algorithm than traditional techniques. Chaos based techniques are highly efficient in case of multimedia data. The proposed algorithm uses the modified logistic map for the generation of chaotic sequence, encrypts the image in single scan, so runs faster and makes the proper use of confusion and diffusion. It dynamically updates the key during execution. This algorithm is secure against the brute force attack and differential attack.

Survey on image encryption techniques using chaotic maps in spatial, transform and spatiotemporal domains

Chaos-based cryptosystems have been an active area of research in recent years. Although these algorithms are not standardized like AES, DES, RSA, etc., chaos-based cryptosystems like Chebyshev polynomials can provide additional security when used with standard public key cryptosystems like RSA and El-gamal. Standard encryption algorithms such as AES have always been the primary choice, but when it comes to image or video encryption, many researchers recommend chaos-based encryption techniques due to their computational efficiency. This paper presents a survey on the most up-to-date chaos-based image encryption techniques and classifies them into spatial, temporal and spatiotemporal domains for better understanding. The significant improvements in the field of image encryption are discussed. In addition, comparative analysis is performed to validate the evaluation matrices for quantifying the encryption algorithms’ security and performance in recent papers.

A New Image Encryption Algorithm Based on Multi Chaotic System

In recent years, encryption technology has been developed rapidly and many image encryption methods have been put forward. The chaos-based image encryption technique is a modern encryption system for images. To encrypt images, it uses random sequence chaos, which is an efficient way to solve the intractable problem of simple and highly protected image encryption. There are, however, some shortcomings in the technique of chaos-based image encryption, such limited accuracy issue. The approach focused on the chaotic system in this paper is to construct a dynamic IP permutation and S-Box substitution by following steps. First of all, use of a new IP table for more diffusion of all image pixels based on a 1D logistic map to build IP table. Secondly, a new S-Box based on 2D-Henon chaos was created using more confusion to replace G-channel image data. Finally, design of a modern image encryption approach. This approach uses the key process confusion and diffusion operation and depend on IP and S-Box proposals in the encryption process and several shuffling operations using the 3D- Lornez chaos theory. Theoretical research and simulation suggest that starting sensitivity value of this method is high, has high protection, and encryption speed. Moreover, it also holds the value of the neighboring RGB close to zero. The studies show that the information security capabilities would be both safer and more efficient, as a result of our image quality assessment study. Number of Differential Pixel Rate Change Attacks (NPSR), Unified Average Altered Intensity (UACI), are quality and strength of encryption processing are proved by pixel correlation, Entropy to be good results.

An image encryption scheme using sequence generated by interval bisection of polynomial function

Chaos based image encryption techniques are well accepted in research communities to perform permutation at pixel/bit level using pseudo-random sequence and changes pixel positions and/or intensity values from which guessing the original image is very hard. Simple computation is the point of attraction of these type of techniques. In parallel, researchers defined permutation using some non-chaotic methods and have established similar, even better results for image encryption in comparison to chaos based techniques. In this article a non-chaotic image encryption technique is proposed. A polynomial is employed to define the pseudo-random sequence. Here, points on the polynomial are selected by repeated interval bisection method and a sequence is defined by the function value at those points. Scrambling of row/column are performed by cyclic shift using the sequence. Value Substitution and iterative XOR operation transform the pixels’ intensity. Bitwise XOR operation with a mask generated from the pseudo-random sequence adds more security to the scheme. Experimental results and security analysis prove its immunity against statistical and differential attack. Comparison of the proposed method with some existing schemes proves its superiority.

A Chaos-Based Image Encryption Technique Utilizing Hilbert Curves and H-Fractals

Image encryption is the most direct and effective technical means for protecting the security of image information. Based on the space filling property of the Hilbert curve and the infinite property of the H-geometric fractal, a new image encryption technique is proposed, which combines the pseudo-randomness of a hyperchaotic system and the sensitivity to initial values. First, the hash value of a plaintext image is calculated using the secure hash algorithm 3 (SHA-3) as the initial value of the piece-wise linear chaotic map (PWLCM) and Rossler chaotic systems, which associates the key with the plaintext. In addition, the chaotic sequences that are generated by the chaotic systems are used to scramble the global pixel positions and the pixel values of the images, thereby disturbing the distribution of the pixel positions and the pixel values. Second, the Hilbert curve and H-fractal are alternately used to scramble the local pixel positions and diffuse the pixel values twice. Finally, the ciphertext feedback is used to further enhance the confusion and diffusion characteristics of the algorithm in order to achieve higher security. The experimental results and security analysis show that the encryption technique has enough key space to resist exhaustive attacks and can effectively resist statistical attacks, differential attacks, noise attacks, and cropping attacks. It can be used for military, judicial, and other privacy-related digital images secure storage and network security transmissions.

Chaos Based Image Encryption using Expand-Shrink Concept

Image information security plays a vital role in computing and communication technologies. This paper describes a new concept of expand and shrink to enhance the strength of chaos based image encryption technique. This method consists of both permutations as well as substitution process for image scrambling and encryption. In permutation plain image is shuffled using chaos technique. Input image undergo two times chaos permutation in-between expand and shrink process leads to substitution. Permutation decreases the correlation between the pixel and substitution increases the entropy of encrypted image. Proposed encryption technique works for both gray-scale and color image. From the experiment highly scrambled image is obtained at the end of encryption process. Decryption process employs exactly reverse process of encryption which results in the reconstructed images.