Customized AES for Securing Data in Sensitive Networks and Applications

Abstract

Developing and improving encryption systems becomes a prerequisite for protecting sensitive data from ever-developing attacks. The Advanced Encryption Standard (AES) is the best recommended symmetric key block cipher for securing data of sensitive networks and applications. However, the AES may be penetrative to some attacks in the future. In this paper, we propose a customized AES to enhance the security of the AES algorithm to be hard to cryptanalysis and become safer to use in sensitive networks and applications whose security is of utmost priority, like military networks and applications. Security of customized AES will be improved by modification in two points; the first uses a new AES key expansion algorithm to remove dependencies between round keys and improve key expansion time, and the second point uses a key-dependent S-box for each round to overcome the problems caused by using a static AES S-box. Finally, results show that the Proposed AES provides a significant enhancement in security compared to the original AES.