Improved Data Encryption Standard Algorithm using Zigzag Scan for Secured Data Transmission

Abstract

The cryptosystem is a combination of cryptographic algorithms used to provide security services for the information. One of them is the data encryption standard also known as DES which is a symmetric-key block cipher released by national bureau of standard (NBS). DES is a block cipher and perform encryption of each block of size 64 bits. Encryption of the data by using an algorithm which translates the original data into an unreadable format which is not easy for the intruder to attack. The DES is secure than the other cryptosystems, because the time required for processing cryptanalysis has minimized and because of the development in the hardware technique, the traditional DES may be unsafe by different kinds of attacks by the different cryptanalysis. This paper implements a new design of DES called the Improved DES which exhibits that the improved DES is secure than the DES against differential cryptanalysis. It divides each substitution box into four sub blocks of 16 bits and then executes the zig-zag function of each of the 4-sub blocks. It improves the standard encryption levels by columnar transposition.