Information security and privacy : 4th Australasian Conference, ACISP'99, Wollongong, NSW, Australia, April 7-9, 1999 : proceedings - Pieprzyk, Josef; Safani-Naivi, Rei; Seberry, Jennifer; Pieprzyk, Josef, 1949-; Safavi-Naini, Rei; Seberry, Jennifer, 1944- (Lecture notes in computer science ; ;, 1999)