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The paper proposes a new image encryption arithmetic. Firstly, the paper introduces a new two-dimensional map. A square image is divided into two isosceles triangles according diagonal. Each pixel in a column is inserted to the adjacent column which utilizes the difference of the number of pixel of two adjacent columns. Then the plain image can be stretched to a line of pixels. The line is fold over...
This paper proposes a new invertible two-dimensional map for image encryption in network. The map is a process of stretch-and-fold. Firstly a square image is divide two parts along the diagonal direction. Then they are stretched respectively and joins a array of pixels. Lastly the array is fold over to a new image. The process shuffles the positions of pixels. The map includes two sub maps: the left...
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