Enhancing AES with Key Dependent S-Box and Transpose MDS Matrix

Abstract

Privacy is an important feature in transmission of data. Due to continuous flow of data over network, there may be a chance of attacks on sensitive data, either passive or active. To provide security, Cryptography plays a vital role by scrambling data into unreadable form. Several techniques have been developed to provide security for digital data transmission. AES is one of the efficient encryption engaged for the past decade. There is every need to improve its security mechanism periodically. In this paper we implement Transpose mix column and S-BOX Rotation to enhance efficiency. This proposed model provides more Avalanche Effect than traditional AES. Moreover, Diffusion and Confusion are crucial in Cryptography. The more the diffusion rate the more secure the data is and is shown in this proposed model. However, S-Box rotation provides more confusion. AES is most efficiently used in Wi-Fi, particularly in WPA2-PSK(AES), so enhancing security mechanism is needed.