Design of an Effective Substitution Cipher Algorithm for Information Security using Fuzzy Logic

The combination of cryptography and fuzzy logic has emerged as a promising component of information security. Acknowledge based model is introduced in the information security. This method includes a substitution cipher known as polyalphabetic cipher. The information that is trying to send is including the text that is alphabets. The existing Substitution cipher known as Vigenere cipher algorithm become impractical when we encounter with number of repeated ciphertext. So as to overcome this, a knowledge based model is constructed by using Fuzzy Logic. And a cipher text is generated which is close to the ideal line so that we have the frequencies of all alphabets equal or very close to each other then it would be impossible for an attacker to proceed with the frequency attack.