This book constitutes the refereed proceedings of the 17th Australasian Conference on Information Security and Privacy, ACISP 2012, held in Wollongong, Australia, in July 2012. The 30 revised full papers presented together with 5 short papers were carefully reviewed and selected from 89 submissions. The papers are organized in topical sections on fundamentals, cryptanalysis, message authentication codes and hash functions, public key cryptography, digital signatures, identity-based and attribute-based cryptography, lattice-based cryptography, and lightweight cryptography.