Salah Albermany, Zahraa Naseer, McEliece in RADG using Diffie-Hellman Key Exchange Security System, Journal of Engineering and Applied Sciences, Volume 15,Issue 17, 2020, Pages 3138-3145, ISSN 1816-949x, jeasci.2020.3138.3145, (https://makhillpublications.co/view-article.php?doi=jeasci.2020.3138.3145) Abstract: A high-performance ciphering algorithm is presented. The proposed method combines the ciphering technique (Reaction Automata Direct Graph (RADG)) with McEliece cryptosystem to obtain higher level of security. This proposed algorithm has dynamic transitions too generated by Deffie-Hellman key exchange. McEliece algorithm is an asymmetric encryption algorithm, adding a higher level of security to the proposed approach called ME-RADG-Diffie-Hellman. Keywords: Public key;RADG;Diffie-Hellman key exchange;security