Abstract
Nowadays in digital world, safeguarding information is an important phase in transmitting messages and doing trades. The increasing growth of computer networks has caused a lot of changes in life style, occupational activities and organizations. Thus, data security has been one of the essential issues in this area. By connecting a local network to global network, outsiders are likely to have access to the organizations’ data. One of the most important challenges about propagating information on internet is to assure inaccessibility of unauthorized people to sensitive information. Various solutions including restricting the use of internet, encoding the data and establishing security have been suggested. To fulfill the security requirements for a safe transaction, operations such as encoding, hiding, etc. are used. Today information is of great importance either in military area or in commercial one. Hence one of the basic needs is to maintain information for transmitting or storing them. Having access to coded information is not possible for unauthorized people and only those having password can decode and use them. Encoding the information is based on the knowledge related to that. On the one hand, hiding is also one of the effective techniques for keeping information since host information is clear and a hidden message may not be discovered. In this study, a new technique is presented for hiding information in encoded images which minimized the error of the previous techniques. In addition, previous techniques have never pointed out to noisy environments and one of the advantages of the introduced technique was to eliminate noise.
Highlights
Encoding has a long history and the first application of it dates to 4000 past years in ancient Egypt.In encoding, transmitting message or information is not done in hiding manner but rather storing information or transmitting message is known
Z 0 0 s i z oi to obtain fractal conversion for each range blocks from domain blocks, we seek a block that the converted form of it or itself equals to that block after adjusting brightness, resolution and equality in size [10] and in this way, each image block is expressed in terms of another block in the same image and as a result, the entire image is a conversion of the same image
A new method is introduced for hiding information. in coded images which minimized error from the previous methods up to an acceptable level
Summary
Encoding has a long history and the first application of it dates to 4000 past years in ancient Egypt. The advent of computers made encoding done on different information according to bits. Natural and real examples of fractals include human lungs, trees, clouds, mountains and the leaves of some trees like fern. Another definition is based on fractal dimension. Fractal is a shape that has a non-integer dimension It means we may have a shape whose dimension is between 1 and 2. Fractals are mathematical geometrical concepts which have been of interest by the scientists of other sciences during recent years and after Bnoite Mandelbrot worked on them and their applications have been demonstrated in physics, chemistry, biology, geology and medicine. Fractals are mathematical geometrical concepts which have been of interest by the scientists of other sciences during recent years and after Bnoite Mandelbrot worked on them and their applications have been demonstrated in physics, chemistry, biology, geology and medicine. [7]
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