Abstract
The recent years have witnessed rapid developments in the field of image encryption algorithms for secure color image processing. Image encryption algorithms have been classified in different ways in the past. This paper reviews the different image encryption algorithms developed during the period 2007-2015, highlighting their contrasting features. At the same time a broad classification of the said algorithms into: (1) full encryption algorithm and (2) partial encryption algorithm, each further sub-classified with respect to their domain orientations (spatial, frequency and hybrid domains) have been attempted. Efforts have also been made to cover different algorithms useful for color images of various color spaces like Red-Green-Blue (RGB), Hue-Saturation-Intensity (HSI), Cyan-Magenta-Yellow (CMY) etc. Chaotic cryptosystems, various transforms like wavelets, affine transforms etc. and visual cryptography systems are being discussed in detail.
Highlights
INTRODUCTIONAn image data is inherently redundant with the pixels highly correlated (This is generally derived from the fact that an image has smooth texture)
The present review focuses on enlisting and exploring various encryption techniques related to image data
Each pixel represented in the image matrix has an intensity value
Summary
An image data is inherently redundant with the pixels highly correlated (This is generally derived from the fact that an image has smooth texture). Lossy compression can be applied to image data before encryption, though this would lead to slight loss of redundant data in the decrypted image [3]. Image compression is another interesting area of research that goes hand in hand with image encryption. In addition to removing redundant data, compression reduces the bandwidth requirement for transmission of the encrypted image along secure channels. Most of the algorithms which are frequency domain- oriented and those that involve usage of transforms like DCT, affine etc. have compression either of lossy or lossless form, inherently added to them
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