Fadlil, Abdul, 		Riadi, Imam, DAN 		Nugrahantoro, Achmad.
" Data Security for School Service Top-Up Transactions Based on AES Combination Blockchain Technology" <em>Lontar Komputer : Jurnal Ilmiah Teknologi Informasi</em> [Online], Volume 11 Nomor 3 (22 December 2020)