scholarly journals AUDIO ENCRYPTION ALGORITHM USING HYPERCHAOTIC SYSTEMS OF DIFFERENT DIMENSIONS

2018 ◽  
Author(s):  
S. N. Lagmiri ◽  
H. Bakhous
Keyword(s):  
Encryption Algorithm ◽  
Different Dimensions ◽  
Audio Encryption ◽  
Hyperchaotic Systems

scholarly journals Audio Encryption Algorithm Based on Chen Memristor Chaotic System

Symmetry ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 17
Author(s):  
Wanying Dai ◽  
Xiangliang Xu ◽  
Xiaoming Song ◽  
Guodong Li
Keyword(s):  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Chaotic System ◽  
Basis Function ◽  
Color Image ◽  
Audio Signal ◽  
Encryption Algorithm ◽  
Audio Signals ◽  
Encryption Algorithms ◽  
Audio Encryption

The data space for audio signals is large, the correlation is strong, and the traditional encryption algorithm cannot meet the needs of efficiency and safety. To solve this problem, an audio encryption algorithm based on Chen memristor chaotic system is proposed. The core idea of the algorithm is to encrypt the audio signal into the color image information. Most of the traditional audio encryption algorithms are transmitted in the form of noise, which makes it easy to attract the attention of attackers. In this paper, a special encryption method is used to obtain higher security. Firstly, the Fast Walsh–Hadamar Transform (FWHT) is used to compress and denoise the signal. Different from the Fast Fourier Transform (FFT) and the Discrete Cosine Transform (DCT), FWHT has good energy compression characteristics. In addition, compared with that of the triangular basis function of the Fast Fourier Transform, the rectangular basis function of the FWHT can be more effectively implemented in the digital circuit to transform the reconstructed dual-channel audio signal into the R and B layers of the digital image matrix, respectively. Furthermore, a new Chen memristor chaotic system solves the periodic window problems, such as the limited chaos range and nonuniform distribution. It can generate a mask block with high complexity and fill it into the G layer of the color image matrix to obtain a color audio image. In the next place, combining plaintext information with color audio images, interactive channel shuffling can not only weaken the correlation between adjacent samples, but also effectively resist selective plaintext attacks. Finally, the cryptographic block is used for overlapping diffusion encryption to fill the silence period of the speech signal, so as to obtain the ciphertext audio. Experimental results and comparative analysis show that the algorithm is suitable for different types of audio signals, and can resist many common cryptographic analysis attacks. Compared with that of similar audio encryption algorithms, the security index of the algorithm is better, and the efficiency of the algorithm is greatly improved.

An Image Encryption Algorithm Based on Random Walk and Hyperchaotic Systems

2020 ◽  
Vol 30 (04) ◽  
pp. 2050060 ◽  
Author(s):  
Cong Xu ◽  
Jingru Sun ◽  
Chunhua Wang
Keyword(s):  
Random Walk ◽  
Image Encryption ◽  
Experimental Results ◽  
Encryption Algorithm ◽  
Original Image ◽  
Chosen Plaintext Attack ◽  
Random Walk Method ◽  
Encryption Algorithms ◽  
Hyperchaotic Systems ◽  
Image Encryption Algorithm

In this paper, we propose an image encryption algorithm based on random walk and two hyperchaotic systems. The random walk method is adopted to scramble the position of pixels within a block. Furthermore, the permutation operation between blocks is presented to enhance the scramble effect. Thus, high correlation among pixels of original image is broken by permutation. Moreover, the chosen plaintext attack is used to test the anti-attack ability of the proposed algorithm. By analyzing experimental results and comparing with other image encryption algorithms, we show that the proposed algorithm has better performance and higher security.

scholarly journals Pseudorandom Number Generator Based on Three Kinds of Four-Wing Memristive Hyperchaotic System and Its Application in Image Encryption

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Xi Chen ◽  
Shuai Qian ◽  
Fei Yu ◽  
Zinan Zhang ◽  
Hui Shen ◽  
...  
Keyword(s):  
Image Encryption ◽  
Secure Communication ◽  
Encryption Algorithm ◽  
Statistical Characteristics ◽  
Pseudorandom Number ◽  
Pseudorandom Number Generator ◽  
Hyperchaotic System ◽  
Number Generator ◽  
Encrypted Image ◽  
Different Dimensions

In this paper, we propose a method to design the pseudorandom number generator (PRNG) using three kinds of four-wing memristive hyperchaotic systems (FWMHSs) with different dimensions as multientropy sources. The principle of this method is to obtain pseudorandom numbers with good randomness by coupling XOR operation on the three kinds of FWMHSs with different dimensions. In order to prove its potential application in secure communication, the security of PRNG based on this scheme is analyzed from the perspective of cryptography. In addition, PRNG has passed the NIST 800.22 and ENT test, which shows that PRNG has good statistical characteristics. Finally, an image encryption algorithm based on PRNG is adopted. In the encryption algorithm, the optimized Arnold matrix scrambling method and the diffusion processing based on XOR are used to obtain the final encrypted image. Through the evaluation of encryption performance, it is concluded that there is no direct relationship between the pristine image and encrypted image. The results show that the proposed image encryption scheme has good statistical output characteristics and security performance in line with cryptography.

scholarly journals A Novel Audio Encryption Algorithm with Permutation-Substitution Architecture

Electronics ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 530 ◽  
Author(s):  
Krasimir Kordov
Keyword(s):  
Performance Test ◽  
Noise Analysis ◽  
Random Number Generator ◽  
Encryption Algorithm ◽  
Rate Analysis ◽  
Key Space ◽  
Speed Performance ◽  
Audio Encryption ◽  
Audio Files ◽  
High Level

In this paper, a new cryptographic method is proposed, designed for audio files’ security. The encryption algorithm is based on classic symmetric models using pseudo-random number generator composed with chaotic circle map and modified rotation equations. The scheme of a new pseudo-random generator is presented and used as basis for chaotic bit-level permutations and substitutions applied to audio files structure for successful encryption. The audio encryption and decryption algorithms are described and explained. Proving the high level of security we provide extensive cryptographic analysis including key sensitivity analysis, key-space analysis, waveform and spectrogram analysis, correlation analysis, number of sample change rate analysis, level of noise analysis and speed performance test.

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