Chaos-based image encryption algorithm ✩

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A fast color image encryption algorithm based on coupled two-dimensional piecewise chaotic map (2012, methodology): “[15] used the two-dimensional cat map to shuffle the position of the image pixels in the spatial domain along with the output of a discretized Chen’s system to mask the pixel values.”
A chaos-based symmetric image encryption scheme using a bit-level permutation (2011, background): “7 bit 2 bit 1 bit a[6][1] a[4][2] a[3][3] a[4][4] a[7][5] a[8][6] a[9][7] a[8][8] a[4][1] a[2][2] a[7][3] a[2][4] a[8][5] a[9][6] a[2][7] a[1][8] a[3][1] a[9][2] a[1][3] a[9][4] a[4][5] a[6][6] a[6][7] a[5][8] a[2][1] a[5][2] a[8][3] a[1][4] a[6][5] a[1][6] a[1][7] a[9][8] a[7][1] a[8][2] a[4][3] a[”
A Fast Image Encryption Scheme based on Chaotic Standard Map (2006, background): “the discretized Chen’s chaotic system for pixel value masking [ 7 ].”
Cryptanalysis of a new image encryption algorithm based on hyper-chaos (2008, background): “So far, many chaos-based image cryptosystems have been proposed [8–18].”