scholarly journals A New Image Encryption Algorithm Based on Chaos and Secure Hash SHA-256

Entropy ◽  
2018 ◽  
Vol 20 (9) ◽  
pp. 716 ◽  
Author(s):  
Shuqin Zhu ◽  
Congxu Zhu ◽  
Wenhong Wang
Keyword(s):  
Image Encryption ◽  
Key Management ◽  
Random Sequence ◽  
Correlation Coefficients ◽  
Feedback Mechanism ◽  
Encryption Algorithm ◽  
Differential Analysis ◽  
Encryption Schemes ◽  
Disturbance Term ◽  
Image Encryption Algorithm

In order to overcome the difficulty of key management in “one time pad” encryption schemes and also resist the attack of chosen plaintext, a new image encryption algorithm based on chaos and SHA-256 is proposed in this paper. The architecture of confusion and diffusion is adopted. Firstly, the surrounding of a plaintext image is surrounded by a sequence generated from the SHA-256 hash value of the plaintext to ensure that each encrypted result is different. Secondly, the image is scrambled according to the random sequence obtained by adding the disturbance term associated with the plaintext to the chaotic sequence. Third, the cyphertext (plaintext) feedback mechanism of the dynamic index in the diffusion stage is adopted, that is, the location index of the cyphertext (plaintext) used for feedback is dynamic. The above measures can ensure that the algorithm can resist chosen plaintext attacks and can overcome the difficulty of key management in “one time pad” encryption scheme. Also, experimental results such as key space analysis, key sensitivity analysis, differential analysis, histograms, information entropy, and correlation coefficients show that the image encryption algorithm is safe and reliable, and has high application potential.

scholarly journals Self-Adaptive Image Encryption Algorithm Based on Quantum Logistic Map

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Youxia Dong ◽  
Xiaoling Huang ◽  
Qixiang Mei ◽  
Yuanju Gan
Keyword(s):  
Image Encryption ◽  
Random Sequence ◽  
Logistic Map ◽  
Correlation Coefficients ◽  
Iteration Process ◽  
Encryption Algorithm ◽  
Random Sequences ◽  
Plain Image ◽  
Image Encryption Algorithm ◽  
Self Adaptive

This study proposes a self-adaptive image encryption algorithm based on the quantum logistic map. First, the initial values are substituted into the quantum logistic map based on an iteration process to generate three random sequences. After preprocessing, three new random sequences with better randomicity were obtained from the generated random sequences. In particular, the correlation coefficients for random sequences before and after preprocessing are compared to determine the best model to make the correlation coefficients closer to zero. Second, one random sequence in the scrambling stage is selected with respect to the plain image. The selected random sequence is then used to perform row-column perturbation on the plain image. Finally, the remaining two random sequences are used to perform forward and reverse diffusion to obtain the final cipher image. Because of the dependence on the plain image, the algorithm can frustrate the chosen-plaintext and known-plaintext attacks. Experimental results show that the proposed encryption algorithm can achieve secure communications.

Analysis of Image Encryption Algorithm Based on Chaotic Signal

2013 ◽  
Vol 756-759 ◽  
pp. 2024-2029
Author(s):  
Yu Chi Zhao ◽  
Jing Liu
Keyword(s):  
Image Encryption ◽  
Chaotic Dynamics ◽  
Random Sequence ◽  
Experimental System ◽  
Chaotic Signal ◽  
Encryption Algorithm ◽  
Dynamics Model ◽  
Computer Simulation Experiment ◽  
Sequence Generator ◽  
Image Encryption Algorithm

This paper, based on the characteristics of the chaotic dynamics system, by analyzing the characteristics of many chaotic dynamics model in image encryption and screening studies such as comparison (computer simulation experiment), combined with some specific practices of modern encryption system, regards the chaotic signal as the carrier hiding image information, for the purpose of image encryption. It regards chaotic system as a pseudo-random sequence generator, uses the way of compounding multiple chaos, combined with image replacement technology, designs image encryption algorithm of practical value and completes the development of the experimental system of image encryption

scholarly journals A Nature Inspired Color Image Encryption Technique to Protect the Satellite Images

2019 ◽  
Vol 9 (03) ◽  
Author(s):  
Bhagyashri I. Pandurangi R ◽  
Meenakshi R. Patil
Keyword(s):  
Image Encryption ◽  
Color Image ◽  
Random Sequence ◽  
Correlation Coefficients ◽  
Secret Key ◽  
Color Image Encryption ◽  
Encrypted Images ◽  
Differential Attacks ◽  
Crossover And Mutation ◽  
Image Encryption Algorithm

A color image encryption algorithm based on chaotic maps is proposed in this paper. The algorithm is based on two bio-operations: crossover and mutation. To enhance the robustness against differential attacks, the mutated image is subjected to scrambling process operated on the pixel values of the image using a random sequence. Experimental results show that the proposed algorithm is capable of generating encrypted images with uniform distribution of the pixel values and very low correlation coefficients of adjacent pixels. It is very sensitive to any change in the secret key values. The results show that the algorithm is robust to statistical and differential attacks.

scholarly journals Image Encryption Algorithm Based on Chaotic Economic Model

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
S. S. Askar ◽  
A. A. Karawia ◽  
Ahmad Alshamrani
Keyword(s):  
Image Encryption ◽  
Chaotic Map ◽  
Security Analysis ◽  
Correlation Coefficients ◽  
Encryption Algorithm ◽  
Economic Systems ◽  
Plain Image ◽  
Encrypted Images ◽  
Image Encryption Algorithm ◽  
Gray Values

In literature, chaotic economic systems have got much attention because of their complex dynamic behaviors such as bifurcation and chaos. Recently, a few researches on the usage of these systems in cryptographic algorithms have been conducted. In this paper, a new image encryption algorithm based on a chaotic economic map is proposed. An implementation of the proposed algorithm on a plain image based on the chaotic map is performed. The obtained results show that the proposed algorithm can successfully encrypt and decrypt the images with the same security keys. The security analysis is encouraging and shows that the encrypted images have good information entropy and very low correlation coefficients and the distribution of the gray values of the encrypted image has random-like behavior.

Chaotic image encryption algorithm based on pseudo-random bit sequence and DNA plane

2019 ◽  
Vol 33 (22) ◽  
pp. 1950263 ◽  
Author(s):  
Xingyuan Wang ◽  
Hongyu Zhao ◽  
Yutao Hou ◽  
Chao Luo ◽  
Yingqian Zhang ◽  
...  
Keyword(s):  
Image Encryption ◽  
Random Sequence ◽  
Security Analysis ◽  
Circular Permutation ◽  
Encryption Algorithm ◽  
Dna Encoding ◽  
Sequence Generation ◽  
Plane Image ◽  
Chaotic Image Encryption ◽  
Image Encryption Algorithm

In this paper, a new chaotic image encryption algorithm based on pseudo-random bit sequence and DNA plane is proposed. The coupled map lattice (CML) is applied to design a pseudo-random bit sequence generation (PBSG) system and use the system to generate the random sequence needed in the encryption process. The initial values and parameters of the system are generated by the SHA-256 hash algorithm combined with given keys. Firstly, the plane image is decomposed into four DNA planes in combination with the DNA encoding rules, and then the four DNA planes are subjected to row circular permutation and column circular permutation. After that, the diffusion operation on each DNA plane is performed. Finally, the four DNA planes are decoded and then combined into a pixel matrix, that is, the final cipher image is obtained. Throughout the encryption process, the choice of DNA encoding and decoding rules is determined by the PBSG system. Simulation results and security analysis show that the algorithm not only has good encryption effect, but also can resist various classic attacks, and has excellent security performance.

scholarly journals Digital Image Encryption Algorithm Design Based on Genetic Hyperchaos

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Jian Wang
Keyword(s):  
Image Encryption ◽  
Algorithm Design ◽  
Feedback Mechanism ◽  
Image Features ◽  
Encryption Algorithm ◽  
Experimental Simulation ◽  
Algorithm Selection ◽  
Characteristics Of Image ◽  
Digital Image Encryption ◽  
Image Encryption Algorithm

In view of the present chaotic image encryption algorithm based on scrambling (diffusion is vulnerable to choosing plaintext (ciphertext) attack in the process of pixel position scrambling), we put forward a image encryption algorithm based on genetic super chaotic system. The algorithm, by introducing clear feedback to the process of scrambling, makes the scrambling effect related to the initial chaos sequence and the clear text itself; it has realized the image features and the organic fusion of encryption algorithm. By introduction in the process of diffusion to encrypt plaintext feedback mechanism, it improves sensitivity of plaintext, algorithm selection plaintext, and ciphertext attack resistance. At the same time, it also makes full use of the characteristics of image information. Finally, experimental simulation and theoretical analysis show that our proposed algorithm can not only effectively resist plaintext (ciphertext) attack, statistical attack, and information entropy attack but also effectively improve the efficiency of image encryption, which is a relatively secure and effective way of image communication.

scholarly journals Design and Analysis of a Novel Chaos-Based Image Encryption Algorithm via Switch Control Mechanism

2020 ◽  
Vol 2020 ◽  
pp. 1-12 ◽  
Author(s):  
Shenyong Xiao ◽  
ZhiJun Yu ◽  
YaShuang Deng
Keyword(s):  
Image Encryption ◽  
Chaotic System ◽  
Control Mechanism ◽  
Encryption Algorithm ◽  
Encryption Scheme ◽  
Pseudorandom Sequences ◽  
Switch Control ◽  
Encryption Schemes ◽  
Lorenz Chaotic System ◽  
Image Encryption Algorithm

Chaos has been widely used in image encryption due to its rich properties. However, it remains an irreconcilable contradiction for security and implementation efficiency for image encryption schemes. In this paper, a novel chaos-based image encryption scheme has been proposed, where the Lorenz chaotic system is applied to generate pseudorandom sequences with good randomness, and a random switch control mechanism is introduced to ensure the security of the encryption scheme. Experimental results demonstrate the effectiveness and superiority of the algorithm.

scholarly journals Cryptanalysis and Improvement on an Image Encryption Algorithm Design Using a Novel Chaos Based S-Box

Symmetry ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 399 ◽  
Author(s):  
Congxu Zhu ◽  
Guojun Wang ◽  
Kehui Sun
Keyword(s):  
Image Encryption ◽  
Algorithm Design ◽  
Security Analysis ◽  
Feedback Mechanism ◽  
Encryption Algorithm ◽  
Security Level ◽  
Diffusion Scheme ◽  
Cryptographic System ◽  
Image Cryptosystem ◽  
Image Encryption Algorithm

This article performs the cryptanalysis of an image encryption algorithm using an S-box generated by chaos. The algorithm has the advantages of simple structure, high encryption efficiency, and good encryption performance. However, an attentive investigation reveals that it has some undiscovered security flaws. The image cryptosystem is totally breakable under proposed chosen-plaintext attack, and only two chosen plain-images are required. An array equivalent to the S-box is constructed by an elaborately designed chosen-plaintext image, and the cipher-image is deciphered without having to know the S-box itself. Both mathematical deduction and experimental results validate the feasibility of the attacking scheme. Furthermore, an improved encryption scheme is proposed, in which a feedback mechanism is introduced, a bidirectional diffusion scheme is designed, and values of the ciphertext are associated with more parameters in each diffusion process. Testing results and security analysis verify that the improved cryptographic system can achieve a higher security level and has a better performance than some of the latest encryption algorithms.

scholarly journals A Secure and Fast Image Encryption Scheme based on Double Chaotic S-Boxes

Entropy ◽  
2019 ◽  
Vol 21 (8) ◽  
pp. 790 ◽  
Author(s):  
Zhu ◽  
Wang ◽  
Zhu
Keyword(s):  
Image Encryption ◽  
Chaotic System ◽  
Security Analysis ◽  
Encryption Scheme ◽  
Differential Analysis ◽  
Simple Method ◽  
Encryption Schemes ◽  
Application Potential ◽  
Time Image ◽  
Image Encryption Algorithm

In order to improve the security and efficiency of image encryption systems comprehensively, a novel chaotic S-box based image encryption scheme is proposed. Firstly, a new compound chaotic system, Sine-Tent map, is proposed to widen the chaotic range and improve the chaotic performance of 1D discrete chaotic maps. As a result, the new compound chaotic system is more suitable for cryptosystem. Secondly, an efficient and simple method for generating S-boxes is proposed, which can greatly improve the efficiency of S-box production. Thirdly, a novel double S-box based image encryption algorithm is proposed. By introducing equivalent key sequences {r, t} related with image ciphertext, the proposed cryptosystem can resist the four classical types of attacks, which is an advantage over other S-box based encryption schemes. Furthermore, it enhanced the resistance of the system to differential analysis attack by two rounds of forward and backward confusion-diffusion operation with double S-boxes. The simulation results and security analysis verify the effectiveness of the proposed scheme. The new scheme has obvious efficiency advantages, which means that it has better application potential in real-time image encryption.

Sign in / Sign up

Export Citation Format

Share Document