Vishal Kumar, Ratnesh Kumar, Mashud A, Barbhuiya, and Monjul Saikia. “Multiple Encryption Using ECC and Its Time Complexity Analysis”. International Journal of Computer Engineering in Research Trends, vol. 3, no. 11, Nov. 2016, pp. 568-72, https://www.ijcert.org/index.php/ijcert/article/view/807.