This volume is a collection of refereed papers presented during AUSCRYPT '90 held in Sydney, Australia, January 8-11, 1990. This was the first conference of a series sponsored by the International Association for Cryptological Research (IACR) in addition to the EUROCRYPT series held in European countries and the CRYPTO series held in Santa Barbara, California.

This text constitutes the refereed proceedings of the 4th Australasian Conference on Information Security and Privacy, ACISP '99, held in Wollongong, New South Wales, Australia in April 1999. The 26 revised full papers presented were reviewed and selected from a total of 53 submissions. The book is divided into topical sections on Boolean functions, key management, cryptanalysis, signatures, RSA cryptosystems, group cryptography, network security, electronic commerce, address control, and odds and ends.

This book constitutes the refereed proceedings of the 4th International Symposium on Cyberspace Safety and Security (CSS 2012), held in Melbourne, Australia, in December 2012. The 30 revised full papers presented together with 7 invited talks were carefully reviewed and selected from 105 submissions. The papers cover the following topics: mobile security, cyberspace attacks and defense, security application adn systems, network and cloud security, wireless security, security protocols and models.