Advance Procedure Of Encryption And Decryption Using Transposition And Substitution

It is very important in today’s world to protect communication procedure from prying eyes, and is needed more than ever before. Cryptography plays a major role in mobile communication, sending emails, exchanging financial information, the security of ATM cards and in innumerable other ways in our daily lives. It is a well-known that Hill cipher succumbs to cryptanalysis relatively easily. In this paper the same effort has been made by using the orthogonal key matrix and presenting the new way of encryption and decryption to strengthen the security of Hill cipher against the known plain text-attack. The proposed scheme is based upon the transposition and then application of the ceasr cipher substitution which makes it almost impossible to break the cipher text. Advance Procedure of Encryption and Decryption Using Transpositionand Substitution