IMAGE ENCRYPTION BY USING ENHANCED AES ALGORITHM: A REVIEW PAPER

Abstract

AES (Advanced Encryption Algorithm) is a block cypher, which is worldwide implemented for encryption of data. Since 2001, it has been recognized as a standard for data protection. AES is a substitution and permutation cypher that generates uncertainty in the algorithm by using the substitution box (S-Box). The key downside of AES is that in the algorithm, it uses static S-Box, which undermines AES security and may be exposed to various algebraic attacks. The new Dynamic AES algorithm developed by key based dynamic S-Box uses dynamic irreducible polynomial and affine constant to solve this problem. The research is carried out on grey scale images and colour images. Using regular AES and Dynamic AES, both images are encrypted and decrypted. Algorithm quality and level of protection are evaluated based on parameters such as Image Histogram Analysis, Adjacent Pixel Correlation Analysis, Image Entropy, Number of Pixels Change Rate (NPCR), Unified Average Changing Intensity (UACI), and Quality of Encryption.