Deoxyribonucleic acid (DNA) for a shared secret key cryptosystem with Diffie hellman key sharing technique

A shared secret key based symmetric cryptographic algorithm using Diffie Hellman key sharing technique has been proposed in the paper. The shared secret key is used for encryption as well as decryption of the intended plain text. But, we are not transferring the original shared secret key through the channel. We are using Diffie Hellman key sharing technique to generate the shared secret key in both the side by exchanging the public key of the sender and receiver with each other through the channel DNA Hybridization technique has been used to produce the cipher text from the DNA sequence of plain text and the shared secret key. A numerical study with the basic parametric assumption confirms that the proposed cryptosystem is very scalable, secure and robust to use in real time system.