An AES - based Robust Image Encryption Scheme

Abstract

The security of digital information has become a major issue during the last three decades. Encryption is one of the ways to ensure confidentiality for the digital data. Protection of multimedia data is now becoming a big challenge to create a healthy digital world. A large number of algorithms for data and image encryption are reported in the literature. Unfortunately, all traditional cryptosystems can‟t fulfill all the requirements of image encryption. Cryptographic weakness or high computational cost does not fulfill the real time requirement for the encryption technique. In this paper a novel approach is developed to encrypt the digital image which ensures better security with optimum cost. A linear transformation is done before encrypting an image by the Advanced Encryption Standard (AES) in ECB mode. The results show that the correlation between adjacent image elements is significantly reduced by employing the proposed scheme compared to other schemes. The histogram, correlation, entropy analysis as well as differential cryptanalysis of proposed image encryption scheme have been done to justify the strength of the proposed scheme. General Terms Security, Image Encryption