NHSKCA: A NEW HEURISTIC FOR SYMMETRIC KEY CRYPTOGRAPHIC ALGORITHM

Abstract

A plain text or clear text is basically any communicating language that human being speaks. A message or plain text can be understood by anybody who knows the language and as long as the message is not codified in any manner. So now we have to use coding scheme to ensure the information is hidden from anyone for whom it is not intended even those who can see the coded data. Cryptography is a method of storing and transmitting data in a particular form so that only those for whom it is intended can read and process it. Cryptography is the practice and study of hiding information. In modern times cryptography is considered as a branch of both mathematics and computer science and is affiliated closely with information theory, computer science and engineering. There are two basic types of cryptography-Symmetric key and asymmetric key cryptography. There are few well known symmetric key algorithms i.e, DES, RSA, MD5, etc. This paper describes cryptography, various symmetric key algorithms in detail and then proposes a new symmetric key algorithm. Algorithms for both encryption and decryption are also provided here. The advantages of this new algorithm are also explained properly.