• AN ENHANCED CRYPTOGRAPHIC SUBSTITUTION METHOD FOR INFORMATION SECURITY

Abstract

In this paper, we brief the importance of cryptography and its two variants transposition and substitution methods, difference between mono alphabetic and poly alphabetic substitution ciphers, mentioned the recent modifications on play fair cipher, then we describe the most popular Vigenere cipher algorithm, the variations in Vigenere cipher and its merits, de merits and finally we explain the Enhanced Vigenere cipher, suitable for encryption and decryption of all characters, numbers and symbols on the key board.