Comparative study of Avalanche effect in DES using binary codes

Abstract

With the continuing progression of digital data exchange in electronic way, information security is becoming more vital in data storage and transmission. Cryptography has come up as a solution which plays a vital role in information security system against malicious attacks. This security system uses some algorithms to scramble data into incomprehensible text which can be only being decoded or decrypted by party those possesses the associated key. In order to apply an appropriate technique in a particular application we are required to know strengths and weakness of the technique. Therefore analysis of these techniques is critically necessary. In this paper a most widely used symmetric encryption technique Data encryption standard (DES) has been implemented using MATLAB software. After the implementing this encryption technique, analysis is done by using a parameter called Avalanche effect. Plaintext and encryption key are mapped in binary code before encryption process. Avalanche Effect is calculated by changing one bit in plaintext keeping the key constant and by changing one bit in encryption key keeping the key constant, Experimental results shows that the proposed algorithm exhibit significant high Avalanche Effect which improves the level of the security.