Image Encryption and Decryption Using Image Gradient Technique
Shetty Deepesh Sadananda, Anusha Karkala · 2013
Cryptography is considered as a method for securing data in a way, such that by applying particular mathematical operations or logic, the original data is converted into data of totally different form which is not easily detectable. This paper gives a methodology of how an image undergoes encryption in two levels namely intensity variation and pixel color value swapping, which travels via network and reaches the intended receiver who performs reverse operation, called decryption, using secret key to get back the original data without risk of information being leaked out to third parties. This paper also puts forward new algorithms developed for varying intensity of each pixel and for swapping pixel values within an image. The numeric values used for above encryption called as 'key' is shared as secret key between sender and receiver which are in turn encrypted as images while sending ,which is a unique factor put forward in this paper. This paper tries to bring about the fact that by simple manipulation of pixel color values(gradient) and not using external images for this methodology stands as a unique factor.