This book constitutes the refereed proceedings of the 18th International Conference on Information and Communications Security, ICISC 2016, held in Singapore, Singapore, in November/December 2016. The 20 revised full papers and 16 short papers presented were carefully selected from 60 submissions. The papers cover topics such as IoT security; cloud security; applied cryptography; attack behaviour analytics; authentication and authorization; engineering issues of cryptographic and security systems; privacy protection; risk evaluation and security; key management and language-based security; and network security.