Buabthong, Narong, Somchart Chokchaitam, Surachai Hirinitichai, and Kanok Musickmas. 2015. “A Designed DES Chip With CPLD Technology”. Science & Technology Asia 2 (2):61-74. https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/42006.