AES is one of the significant encryption algorithms available till date. Several studies have been made on the efficiency and performance of AES. This paper is a study of the various research work on AES. The studies help us understand the advantages of the encryption algorithm and gives us a better understanding of its working. Some introduce a new technology in the implementation; some introduce a new environment in which to do the implementation. The information gathered from all will be of use in further modifications to AES. © 2016,International Journal of Pharmacy and Technology. All rights reserved.