Intensifying the Security of Information by the Fusion of Random Substitution Technique and Enhanced DES

Abstract

Information security is the process of defending information from unauthorized access and loss. Nowadays in most of the organizations, information is accessed through online. So there is a need to safeguard the information from attackers and hackers. Cryptography is the method of storing and transmitting data in an unreadable form so that only indented user can read and process it. There are two categories of cryptography: symmetric key and asymmetric key encryption algorithms. Symmetric key algorithms use single key for both encryption and decryption. RC2, RC4, DES, Triple DES, IDEA etc. are some of eminent existing symmetric key algorithms. In this paper, we tried to enhance the security of DES, which is now considered to be insecure for many applications. We tried to provide double security by adding a random substitution technique before applying EDES algorithm where we modified the round function and increased the number of rounds from 16 to 32. The performance of the proposed technique is compared with traditional DES algorithm by means of avalanche effect and plaintext sensitivity.