W. S. Wardhono, N. D. Priandani, M. T. Ananta, K. C. Brata, and H. Tolle, “End-to-End Privacy Protection for Facebook Mobile Chat based on AES with Multi-Layered MD5”, Int. J. Interact. Mob. Technol., vol. 12, no. 1, pp. pp. 160–167, Jan. 2018.