Color Image Encryption Scheme Based on Chaotic Map

In this paper, a chaos-based image encryption scheme with stream cipher structure is proposed. The key component of the encryption system is a pseudo-random bit generator (PRBG) based on a chaotic map and a linear feedback shift register. The proposed PRBG is not only passes the statistical tests, but also improve the security. The overall design of the image encryption scheme is to be explained while detail cryptanalysis is given.

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A Tweak-Cube Color Image Encryption Scheme Jointly Manipulated by Chaos and Hyper-Chaos

Applied Sciences ◽

10.3390/app9224854 ◽

2019 ◽

Vol 9 (22) ◽

pp. 4854

Author(s):

Li-Lian Huang ◽

Shi-Ming Wang ◽

Jian-Hong Xiang

Keyword(s):

Image Encryption ◽

Chaotic Maps ◽

Complex Dynamics ◽

Color Image ◽

Chaotic Map ◽

Original Position ◽

Hyperchaotic System ◽

Encryption Scheme ◽

Color Image Encryption ◽

Key Space

This paper proposes a novel tweak-cube color image encryption scheme jointly manipulated by chaos and hyper-chaos. One-dimensional (1D) chaotic maps are effortless to operate, but the key space is relatively small. The hyperchaotic system has complex dynamics properties, which are capable of compensating for the defects of 1D chaotic maps. Thus, we first raise an improved 1D chaotic map with an increased key space. Then, we associate it with a four-dimensional (4D) hyperchaotic system to generate the key streams and further rotate and shift the rows and columns of each component of Red (R), Green (G), and Blue (B) for the color image. The permuting mode is to disturb the original position of the pixels by mimicking the way of twisting the Rubik’s cube. Moreover, the key stream updated by the plain images is also utilized for diffusion and scramble at the bit level. As a consequence, our cryptosystem enhances the security without at the expense of increasing time cost.

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Color Image Encryption with Cipher Feedback and Coupling Chaotic Map

International Journal of Bifurcation and Chaos ◽

10.1142/s0218127420501734 ◽

2020 ◽

Vol 30 (12) ◽

pp. 2050173 ◽

Cited By ~ 1

Author(s):

Hongjun Liu ◽

Abdurahman Kadir ◽

Chengbo Xu

Keyword(s):

Image Encryption ◽

Color Image ◽

Chaotic Map ◽

Nonlinear Behavior ◽

Encryption Algorithm ◽

Encryption Scheme ◽

Color Image Encryption ◽

Quadratic Map ◽

Previous Round ◽

Image Encryption Algorithm

Based on the classic quadratic map (CQM) with abundant bifurcations and periodic windows, a new 3D improved coupling quadratic map (3D-ICQM) is constructed, and its phase diagram, Lyapunov exponent (LE) and randomness testing by TestU01 demonstrated that it has better ergodicity, more complex nonlinear behavior, larger chaotic range and better randomness. To investigate its application in cryptography, a 3D-ICQM based color image encryption algorithm with round key expansion is designed. To further enhance the randomness of key stream, the hash value of intermediate cipher of the previous round is converted into new initial values and fed back into 3D-ICQM, to generate the key stream for the current round. The security and statistical analyses demonstrated that the encryption scheme has better security performance than several existing algorithms.

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