Salah Albermany, Maryam Nathim, Zahir M. Hussain, CRADG: A Chaotic RADG Security System, Journal of Engineering and Applied Sciences, Volume 12,Issue 16, 2017, Pages 4118-4122, ISSN 1816-949x, jeasci.2017.4118.4122, (https://makhillpublications.co/view-article.php?doi=jeasci.2017.4118.4122) Abstract: A high-performance ciphering algorithm is presented. The proposed method combines old school ciphering (Reaction Automata Direct Graph (RADG)) with chaotic systems to obtain higher level of security. Chaotic sequences are highly sensitive to any changes in their parameters, adding a higher level of security to the proposed approach, called CRADG. Keywords: Chaos;RADG;security;parameters;ciphering;system