This book constitutes the refereed proceedings of the Second International Workshop on Security, IWSEC 2007, held in Nara, Japan, October 29-31, 2007.

The 30 revised full papers presented were carefully reviewed and selected from 112 submissions. The papers are organized in topical sections on Software and Multimedia security, Public-key cryptography, Network security, E-commerce and Voting, Operating systems, Security and Information management, Anonymity and Privacy and Digital signatures, Hash function and Protocol.

This book constitutes the refereed proceedings of the 14th International Conference on Information Security Practice and Experience, ISPEC 2018, held in Tokyo, Japan, in September 2018. The 39 papers presented in this volume were carefully reviewed and selected from 73 submissions. They were organized in topical sections named: system security; public key cryptography; searchable and functional encryption; post-quantum signature schemas; security protocols; network security; authentication; side-channel attacks; security for cyber-physical systems; security in mobile environment; secure computation and data privacy; and cryptographic protocols.

This book constitutes the proceedings of the 15th International Conference on Applied Cryptology and Network Security, ACNS 2017, held in Kanazawa, Japan, in July 2017. The 34 papers presented in this volume were carefully reviewed and selected from 149 submissions. The topics focus on innovative research and current developments that advance the areas of applied cryptography, security analysis, cyber security and privacy, data and server security.