TITLE:
On Rijndael ByteSub Transformation
AUTHORS:
W. Eltayeb Ahmed
KEYWORDS:
Rijndael Cipher, Advanced Encryption Standard, Multiplicative Inverse, XOR Operation
JOURNAL NAME:
Applied Mathematics,
Vol.10 No.3,
March
28,
2019
ABSTRACT: 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.