A. J. Cipher

摘要

Cryptography is one of the most secure fields to transmit the data over the network. On that point are various cipher techniques available for encrypting the messages such as Ceaser Cipher, Modified Ceaser Cipher, Monoalphabetic Cipher, Polyalphabetic Cipher, Vernam Cipher etc. One of the most famous technique is Vigenere Cipher. The Vigenere cipher is a method of Encrypting alphabetic text by applying a series of different Caesar ciphers based on the letters of a keyword. It is a Polyalphabetic cipher technique which uses the Vigenere table for the cognitive operation of encryption of alphabets. This paper extends the Vigenere table by including numerical data and special characters so that the numbers or particular character can also be encrypted using this technique. It comprises the encryption process of Vigenere Cipher and Ceaser Cipher for getting the ciphertext from plaintext and key.