Author(s)

W. Eltayeb Ahmed^1,2

¹Mathematics and Statistics Department, Faculty of Science, Imam Mohammad Ibn Saud Islamic University, Riyadh, KSA.
²Department of Basics and Engineering Sciences, Faculty of Engineering, University of Khartoum, Khartoum, Sudan.

The first step in converting a plaintext to ciphertext by the famous Advanced Encryption Standard (AES), which is called Rijndael ByteSub Transformation, involves some operations: computing a multiplicative inverse, multiplying this multiplicative inverse by a specific matrix, and adding the result to a specific vector. The purpose of this research is to simplify these operations. This paper gives elegant techniques and presents the matrices multiplication as simple XOR operations, and the result is a simple, straightforward way finding the transformation.

Rijndael Cipher, Advanced Encryption Standard, Multiplicative Inverse, XOR Operation

Ahmed, W. (2019) On Rijndael ByteSub Transformation. Applied Mathematics, 10, 113-118. doi: 10.4236/am.2019.103010.