08-17-2017, 12:07 AM
Recent investigations of image encryption algorithms have increasingly relied on chaotic systems, but the drawbacks of small key space and weak security in one-dimensional chaotic crypto systems are obvious. This paper, a new image coding scheme employing one of three dynamic chaotic systems (chaotic Lorenz or Chen system or selected 16-byte key based LU) to mix the position of image pixels (position permutation of Pixels) and uses another of the same three chaotic maps to confuse the relationship between the encrypted image and the simple image (diffusion of the pixel value), thus significantly increasing the resistance to attacks. The proposed system has the advantage of having a larger key space, smaller iteration times and high security analysis such as key space analysis, statistical analysis and sensitivity analysis.
The results show that the proposed system is highly efficient and robust. Image encryption schemes have been increasingly studied to meet the demand for secure transmission of images in real time over the Internet and over wireless networks. The traditional image encryption algorithm, such as the standard data encryption (DES), has the weakness of low-level efficiency when the image is large. Chaos-based encryption has suggested a new and efficient way of dealing with the intractable problem of fast, highly secure image encryption. After Matthews proposed the chaotic encryption algorithm in 1989, increasing research on image encryption technology is based on chaotic systems. Many articles on the chaotic cipher scheme have recently been published. Chaotic systems have many important properties, such as the sensitive dependence of initial conditions and system parameters, pseudorandom property, non-periodicity and topological transitivity, and so on. Most properties meet certain requirements such as diffusion and blending in the sense of cryptography. Therefore, chaotic cryptosystems have more useful and practical applications. A one-dimensional chaotic system with the advantages of high-level efficiency and simplicity, such as logistics map, has been widely used now. But its weakness, such as small key space and weak security, is also disturbing