Conference Paper

Digital Image Encryption Algorithm Based on Chaos and Improved DES

DOI: 10.1109/ICSMC.2009.5346839 Conference: Proceedings of the IEEE International Conference on Systems, Man and Cybernetics, San Antonio, TX, USA, 11-14 October 2009
Source: DBLP

ABSTRACT In recent years, encryption technology has been developed quickly and many image encryption methods have been put forward. Chaos based image encryption technique is a new encryption technique for images. It utilizes chaos random sequence to encrypt image, which is an efficient way to deal with the intractable problem of fast and highly secure image encryption. However, the chaos based image encryption technique has some deficiencies, such as the limited accuracy problem. This paper researches on the chaotic encryption, DES encryption and a combination of image encryption algorithm, and simulate these algorithms, through analysis of the algorithm to find the gaps. And on this basis, the algorithm has been improved. The new encryption scheme realizes the digital image encryption through the chaos and improving DES. Firstly, new encryption scheme uses the logistic chaos sequencer to make the pseudo-random sequence, carries on the RGB with this sequence to the image chaotically, then makes double time encryptions with improvement DES, displays they respective merit. Theoretical analysis and the simulation indicate that this plan has the high starting value sensitivity, and enjoys high security and the encryption speed. In addition it also keeps the neighboring RGB relevance close to zero. The algorithm can be used in the actual image encryption.

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    ABSTRACT: A new image encryption scheme based on hyper chaotic system and Fuzzy Cellular Automata is proposed in this paper. Hyper chaotic system has more complex dynamical characteristics than chaos systems. Hence it becomes a better choice for secure image encryption schemes. Four hyper chaotic systems are used to improve the security and speed of the algorithm in this approach. First, the image is divided into four sub images. Each of these sub images has its own hyper chaotic system. In shuffling phase, Pixels in the two adjacent sub images are selected for changing their positions based upon the generated numbers of their hyper chaotic systems. Five non-uniform Fuzzy Cellular Automata used in encryption phase. Used rule to encrypt a cell is selected based upon cell's right neighbor. By utilization of two different encryption methods for odd and even cells, problem of being limited to recursive rules in rule selecting process in these FCAs is solved. The results of implementing this scheme on some images from USC-SIPI database, shows that our method has high security and advantages such as confusion, diffusion, and is sensitive to small changes in key.
    22nd Iranian Conference on Electrical Engineering (ICEE 2014); 05/2014
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    [Show abstract] [Hide abstract]
    ABSTRACT: A new image encryption scheme based on hyper chaotic system and Fuzzy Cellular Automata is proposed in this paper. Hyper chaotic system has more complex dynamical characteristics than chaos systems. Hence it becomes a better choice for secure image encryption schemes. Four hyper chaotic systems are used to improve the security and speed of the algorithm in this approach. First, the image is divided into four sub images. Each of these sub images has its own hyper chaotic system. In shuffling phase, Pixels in the two adjacent sub images are selected for changing their positions based upon the generated numbers of their hyper chaotic systems. Five non-uniform Fuzzy Cellular Automata used in encryption phase. Used rule to encrypt a cell is selected based upon cell's right neighbor. By utilization of two different encryption methods for odd and even cells, problem of being limited to recursive rules in rule selecting process in these FCAs is solved. The results of implementing this scheme on some images from USC-SIPI database, shows that our method has high security and advantages such as confusion, diffusion, and is sensitive to small changes in key.
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    ABSTRACT: The security of digital images attracts much attention recently. For images the transformation can be implemented at two levels, the first one consists of the pixel value permutation and the second one consists of position permutation. In this paper, we propose an encryption scheme for digital images with new pixel position permutation method based on Evolvable Hardware (EHW). In this work, we use EHW to find an equation for mapping functions for encryption and decryption process. The main contribution of this work is that we can evolve arbitrary mapping functions by using EHW. Therefore, there is no limit in selecting map functions. This method of permutation is very fast and cost effective for implementation on reconfigurable devices like FPGAs.