High Quality Content by WIKIPEDIA articles! Lawrence Peter "Lawrie" Brown is a cryptographer and computer security researcher, currently a Senior Lecturer at the Australian Defence Force Academy. His notable work includes the design of the block ciphers LOKI and LOKI97. He received his Ph.D. in mathematics from the University of New South Wales in 1991, with a dissertation on the design of LOKI and the cryptanalysis of the Data Encryption Standard.