| The fascinating developments in digital information transmissions and network communications during this century have created a great demand for real-time secure image transmission over the Internet. The chaos-based encryption is not a very new idea. The scholars were already used the nonline parameters to design a cryptographic algorithms. Due to the exceptionally desirable properties of mixing and sensitivity to initial conditions and parameters of chaotic maps, and chaos-based algorithms have shown some exceptionally good properties in many concerned aspects regarding security, complexity, speed, and computational overhead, etc. Chaos-based encryption has suggested a new and efficient way to deal with the intractable problem of fast and highly secure image encryption. So we can used this way to encrypt the complex systems and the effect were very well. The content is as follows:I. Chaos, digital image processing and information encryption.In this section, we introduce the fundamental conception of the 2-D chaos and spatial chaos, we also discuess the actual state of the digital image processing and encryption. Then we illustrate the mainly efficiet way to encrypt the digital images.II. A 2-D image encryption scheme based on chaotic Baker maps and Catmaps.Encryption of images is different from that of texts due to some intrinsic features of images such as bulk data capacity and high redundancy, which are generally difficult to handle by traditional methods. In this section, we enumerate two kinds of accepted chaotic maps, and point out the advantages and disadvantages of this two chaotic maps.III. A plane image encryption system based on 2-D chaotic maps.In this part, we suggest a typical example based on 2-D Cat maps. Since digital images are usually expressed as two-dimensional arrays, in order to fast de-correlate the relations among pixels, a Cat map is introduced and then used to shuffle the positions or grey values of pixels in the image. Meanwhile, to confuse the relationship... |
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