IngentaConnect A chaotic image cryptosystem based on Toeplitz and Hankel matrice...

Author: Ye, G.D.¹

Source: Imaging Science Journal, The, Volume 57, Number 5, October 2009 , pp. 266-273(8)

Abstract:

Because of properties in chaos system such as the sensitive dependence on initial conditions, system parameters, pseudorandom property and ergodicity, chaotic image encryption algorithm can suggest a new and efficient way of encryption scheme, which has been studied more and more in recent years. A novel chaotic image encryption algorithm based on Toeplitz matrix and Hankel matrix is proposed in this paper. We shuffle totally the positions of image pixels to confuse the relationship between the plain image and cipher image combined with Toeplitz matrix, Hankel matrix and logistic chaotic system. Another hyper-chaos system of Chen's chaotic system is taken to change the grey values of image pixels to enhance the security further. Experimental results in Sections 3 and 4 demonstrate that the key space is large enough and the key is sensitive to initial conditions to resist the brute force attack in the proposed algorithm. Additionally, the distribution of grey values in encrypted image has a random-like behaviour to resist statistical analysis.

Keywords: TOEPLITZ MATRIX; HANKEL MATRIX; CHAOTIC SYSTEM; IMAGE ENCRYPTION; SENSITIVITY

Document Type: Research article

DOI: 10.1179/136821909X12490307952919

Affiliations: 1: College of Science, Guangdong Ocean University, Zhanjiang 524088, China

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A chaotic image cryptosystem based on Toeplitz and Hankel matrices