Ira Nath, Deepashree Bhattacharyya, Agnisuddha Mandal, Nandini Kundu, and Oindrila De. “NHSKCA: A NEW HEURISTIC FOR SYMMETRIC KEY CRYPTOGRAPHIC ALGORITHM”. International Journal of Computer Engineering in Research Trends, vol. 4, no. 12, Dec. 2017, pp. 547-51, https://www.ijcert.org/index.php/ijcert/article/view/720.