Open Access

ARTICLE

A Novel Approach for Security Enhancement of Data Encryption Standard

Dawood Shah^1,*, Tariq Shah¹, Sajjad Shaukat Jamal², Mohammad Mazyad Hazzazi², Amer Aljaedi³, Adel R. Alharbi³

1 Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan
2 Department of Mathematics, College of Science, King Khalid University, Abha, Saudi Arabia
3 College of Computing and Information Technology, University of Tabuk, Tabuk, 71491, Saudi Arabia

* Corresponding Author: Dawood Shah. Email:

Computers, Materials & Continua 2023, 75(3), 5073-5086. https://doi.org/10.32604/cmc.2023.020513

Received 27 May 2021; Accepted 14 January 2022; Issue published 29 April 2023

Abstract

Data Encryption Standard (DES) is a symmetric key cryptosystem that is applied in different cryptosystems of recent times. However, researchers found defects in the main assembling of the DES and declared it insecure against linear and differential cryptanalysis. In this paper, we have studied the faults and made improvements in their internal structure and get the new algorithm for Improved DES. The improvement is being made in the substitution step, which is the only nonlinear component of the algorithm. This alteration provided us with great outcomes and increase the strength of DES. Accordingly, a novel good quality S-box construction scheme has been hired in the substitution phase of the DES. The construction involves the Galois field method and generates robust S-boxes that are used to secure the scheme against linear and differential attacks. Then again, the key space of the improved DES has been enhanced against the brute force attack. The outcomes of different performance analyses depict the strength of our proposed substitution boxes which also guarantees the strength of the overall DES.

---

Keywords

---