查看文章

Swapping a row with a row, a column with a column or row with a column are usual operations carried out to scramble the given input plain image. To introduce more complications for the potential hackers, a novel grayscale image encryption scheme using the variable length row-column swapping based scrambling (VLRCSBS) has been proposed in this study. Security of the cipher would be improved in this way. Two chaotic maps, Henon map and piecewise linear chaotic map (PWLCM) have been used. These maps provide three streams of random numbers. Two more streams of random numbers have been created by manipulating the two streams of Henon map. After the grayscale image is input, arbitrary row and column are selected from this image to realize the scrambling effects. A randomly selected vector of pixels from these selected rows and columns is swapped with each other for a number of …