A Novel Approach for Security Enhancement of Data Encryption Standard  

作　　者：Dawood Shah Tariq Shah Sajjad Shaukat Jamal Mohammad Mazyad Hazzazi Amer Aljaedi Adel R.Alharbi 

机构地区：[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

出　　处：《Computers, Materials & Continua》2023年第6期5073-5086,共14页计算机、材料和连续体（英文）

摘　　要：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 6×6 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 out-comes of different performance analyses depict the strength of our proposed substitution boxes which also guarantees the strength of the overall DES.

关 键 词：DES S-BOX linear cryptanalysis differential cryptanalysis 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]