Design and Analysis of a Robust Compression Friendly Image Encryption Scheme
Gulshan Saleem, Nisar Ahmed, Hassan Khalid · International Journal of Energy Information and Communications · 2017
Encryption is the process of converting data into a disguised and unintelligible form for illicit use.Such security is needed in storage and transmission of digital images over an unreliable medium.Since, digital images have special features such as multiple channel information, high correlation, high redundancy and bulk data that enforce special requirements on image encryption schemes.This paper presents a robust color image encryption scheme using discrete cosine transform.In this technique, the image is split into three RGB channels and block based permutation is performed on an individual channel.This permuted image is further processed using orthonormal basis vectors in discrete cosine domain to generate cipher.Finally, these three channels are fused together to get the encrypted image.Furthermore, the performance of proposed technique is analyzed against Different parameters as information entropy analysis, correlation coefficient analysis; number of pixel change rate, unified average change intensity, compression friendliness and the security is evaluated against brute force, statistical and differential attacks.The experimental results are discussed in details and encryption scheme is found to have reasonable security against various attacks and have shown good performance.