Security of RGB image data by affine hill cipher over [formula omitted] and [formula omitted] domains with Arnold transform

Abstract

These days, security of sensitive information is a major concern. Cryptography allows transmission of data from one end to the other, both, securely and secretly. Here we have designed a novel cryptosystem for security of RGB images by affine hill cipher (AHC) over SLn(Fq) and Mn(Fq) domains with Arnold transform (AT). The security of color images is designed by the existing techniques with the help of keys only, but proposed cryptosystem provides security of RGB image data on the basis of the keys and the arrangement of AHC parameters. Additionally, key multiplication side (pre or post) with a RGB image data is also inevitable to know, to correctly decrypt the encrypted image data. In this approach, we have considered multiplicative keys of affine hill cipher from SLn(Fq) domain and additive keys of affine hill cipher from Mn(Fq) domain, which provides exorbitant key space for the proposed cryptosystem. Experimental results and security analysis of the cryptosystem are given to the justification for the stalwartness of the proposed cryptosystem. This method would have large potential usage in digital RGB image processing and security.