Hill Cipher Key Generation Algorithm by using Orthogonal Matrix
International Journal of Innovative Science and Modern Engineering (IJISME), 3 (3):
5-7 (February 2015)Abstract
The role of cryptography in today’s world is significant. It secures information mathematically by mailing massage with a key. Hill cipher is one of the most famous symmetric cryptosystem that can be used to protect information from unauthorized access. This paper suggest a new technique in Hill cipher, here we are establishing the complex procedure of key generation for the process of encryption. This paper explains how the orthogonal matrix can be useful for the generating the key matrix in Hill cipher. Hill cipher is a matrix based polygraphic substitution. For example abcd= ab cd ef… or abc def…and so on. The purpose of generating the key by using orthogonal matrix is to overcome the disadvantage of non invertible matrix in Hill cipher. This paper discovers the idea of generating key that is basically the reflection on a given plane in 3 . The proposed concept is very easy to implement but it will be more difficult for the attacker to get the key.