الصغير شادي. “Improvement of Qualification and Throughput of Hybrid Systems for Electronic Mail Security With Using RC6 – Elgamal – MD5 Encryption Algorithms”. Tishreen University Journal -Engineering Sciences Series 42, no. 4 (October 1, 2020). Accessed April 20, 2024. https://journal.tishreen.edu.sy/index.php/engscnc/article/view/9913.