An image encryption algorithm based on the mixed chaotic sequence

2010 ◽  
Vol 6 (4) ◽  
pp. 310-313 ◽  
Author(s):  
Mei-lin Wang ◽  
Qing Liu ◽  
Ya Li
Keyword(s):  
Image Encryption ◽  
Chaotic Sequence ◽  
Encryption Algorithm ◽  
Image Encryption Algorithm

scholarly journals A Hyperchaotic Color Image Encryption Algorithm and Security Analysis

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Chenghai Li ◽  
Fangzheng Zhao ◽  
Chen Liu ◽  
Lei Lei ◽  
Jie Zhang
Keyword(s):  
Image Encryption ◽  
Color Image ◽  
Gray Code ◽  
Chaotic Sequence ◽  
Encryption Algorithm ◽  
Hyperchaotic System ◽  
Color Image Encryption ◽  
One Dimensional ◽  
Dimensional Matrix ◽  
Image Encryption Algorithm

The current common color image encryption algorithms applying “scrambling-diffusion” have some problems, such as the small key space, the cumbersome encryption process, and the security vulnerability. Aiming at these problems, this paper proposes a new color image encryption algorithm based on the hyperchaotic system and applying “transforming-scrambling-diffusion” model. Before scrambling, in accordance with the plaintext itself attributes, the number of iterations was calculated, all the pixel values of color image were transformed into gray code iteratively, and then the chaotic sequence was generated from the four-dimensional hyperchaotic system. Pixel matrix after gray code transformation was converted to one-dimensional matrix. The chaotic sequence was sorted and the one-dimensional matrix was changed positions correspondingly to complete the whole domain scrambling. And then, bit-operation was executed for image diffusion. The ciphertext can be obtained by matrix transformation. The key sensitivity, histogram, information entropy, correlation, and other evaluation indexes were calculated and analyzed through the simulation experiment. Compared with other algorithms, it can be proved that the encryption algorithm has the strong antiattack ability.

scholarly journals Secure Image Encryption Based on an Ideal New Nonlinear Discrete Dynamical System

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
R. M. Lin ◽  
T. Y. Ng
Keyword(s):  
Dynamical System ◽  
Image Encryption ◽  
Discrete Dynamical System ◽  
Chaotic Sequence ◽  
Encryption Algorithm ◽  
Plain Text ◽  
System Parameters ◽  
Key Space ◽  
Highly Nonlinear ◽  
Image Encryption Algorithm

It is well known that encryption algorithms developed based on Logistic map suffer from limited key space due to the narrow regions of system parameters which can be used, potential risk of security in the presence of numerous periodic windows within the key space, and weakness in known-plain-text attack due to the inherent correlation among the chaotic sequence used for encryption. To overcome these existing problems, this paper presents a secure image encryption algorithm based on a new highly nonlinear discrete dynamical system with ideal chaotic characteristics. Transcendental functions are introduced together with modulo operations which physically represent discontinuous time-varying nonlinearities, leading to extremely complex chaotic behavior that is highly sensitive to system parameters and initial conditions, both of which are considered as the key for the cryptosystem. Extensive numerical experiment results have revealed that the proposed image encryption algorithm offers advantages of unlimited key space and high-level security, since those problematic periodic windows are no longer present within the key space, and it is extremely robust against known-plain-text attack, since the chaotic sequence generated bears no correlation whatsoever due to the folding effect of modulo operation. The algorithm makes truly efficient yet highly secure image encryption based on chaotic systems a reality.

Image encryption algorithm based on PGL(2,GF(28)) S-boxes and TD-ERCS chaotic sequence

2012 ◽  
Vol 70 (1) ◽  
pp. 181-187 ◽  
Author(s):  
Iqtadar Hussain ◽  
Tariq Shah ◽  
Muhammad Asif Gondal
Keyword(s):  
Image Encryption ◽  
Chaotic Sequence ◽  
Encryption Algorithm ◽  
Image Encryption Algorithm

scholarly journals An Image Encryption Algorithm Based on a New Hybrid Power Exponent Chaotic System

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Dongyao Zou ◽  
Ming Li ◽  
Jun Li ◽  
Zhigang Li
Keyword(s):  
Image Encryption ◽  
Chaotic System ◽  
Chaotic Sequence ◽  
Encryption Algorithm ◽  
Power Exponent ◽  
One Dimensional ◽  
Hybrid Power ◽  
New Chaotic System ◽  
Value Range ◽  
Image Encryption Algorithm

Aiming at the problem of a small parameter value range when a one-dimensional chaotic system presents a chaotic state, this paper proposes a new type of hybrid power exponential chaotic system (HPECS). HPECS combines the classic one-dimensional Sine chaotic system to form a new chaotic system (HPECS-SS). Experiments show that the obtained new chaotic system has better chaotic performance, a more extensive parameter value range, and higher sensitivity. Simultaneously, on the basis of HPECS-SS, a new image encryption algorithm is proposed. The algorithm uses the key generated by the SHA-512 algorithm and HPECS-SS to iteratively output the chaotic sequence, SFY algorithm combines the chaotic sequence to perform two rounds of scrambling on the plaintext sequence to obtain the scrambling sequence, and finally, through the modulus operation to diffuse the scrambling sequence to form the encryption matrix of the plaintext image, simulation experiment analysis shows that the algorithm has a large key space, good encryption effect, and security; the pixel change rate (NPCR) and the normalized average change intensity (UACI) are close to ideal values which can resist various cryptanalysis and attacks.

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