Random Invertible Key Matrix Decomposition for Classical Cryptography

Cryptography is assumed to be an important part of the secret message composing. It is the way of securing plain text by changing it into cipher text using some algorithms. Cryptography is utilized to provide the secrecy of cipher text during transmission from an adversary. The intent of this paper is to introduce LU decomposition technique to generate the key matrix which makes the key more complex by enhancing the security of the message using invertible key matrix.