This book constitutes the refereed proceedings of the 10th International Conference on Information Security Conference, ISC 2007, held in Valparaiso, Chile, October 9-12, 2007.

The 28 revised full papers presented were carefully reviewed and selected from 116 submissions. The topics include Intrusion Detection, Digital Rights Management, Symmetric-Key Cryptography, Cryptographic Protocols and Schemes, Identity-Based Schemes, Cryptanalysis, DoS Protection, Software Obfuscation, Public-Key Cryptosystems, Elliptic Curves and Applications and Security Issues in Databases.

The 1999 International Information Security Workshop, ISW'99, was held on Monash University's Malaysia Campus, which is about 20km to the south west of downtown Kuala Lumpur, November 6-7, 1999. ISW'99soughtadi erentgoalfromitspredecessor, ISW'97, heldinIshikawa, Japan, whose proceedings were published as Volume 1396 of Springer Verlag's LNCS series. The focus of ISW'99 wason the following emerging areasof imp- tance in information security: multimedia watermarking, electronic cash, secure software components and mobile agents, and protection of software. Theprogramcommitteereceived38fullsubmissionsfrom12countriesand- gions: Australia, China, France, Germany, Hong Kong, Japan, Korea, Malaysia, Singapore, Spain, Taiwan, and USA, and selected 23 of them for presentation. Among the 23 presentations, 19 were regular talks and the remaining 4 were short talks. Each submission was reviewed by at least two expert referees. We are grateful to the members of the program committee for reviewing and selecting papers in a very short period of time. Their comments helped the authors improve the n al version of their papers. Our thanks also go to Patrick McDaniel, Masaji Kawahara, and Yasuhiro Ohtaki who assisted in reviewing papers. In addition, we would like to thank all the authors, including those whose submissions were not accepted, for their contribution to the success of this workshop. The workshop was organized with the help of local committee members, - cluding Cheang Kok Soon, Hiew Pang Leang, Lily Leong, and Robin Pollard.

This book constitutes the strictly refereed post-workshop proceedings of the First International Workshop on Information Security, ISW'98, held in Tatsunokuchi, Ishikawa, Japan, in September 1997. The volume presents six invited surveys together with 25 thoroughly revised full papers selected from 39 submissions. Among the topics covered are public-key cryptosystems, cryptoanalysis, digital signatures, hardware/software implementation, key management, key sharing, security management, electronic commerce, and quantum cryptology.

The Fourth International Workshop on Security (IWSEC 2009) was held at Toyama International Conference Center, Toyama, Japan, October 28-30, 2009. The workshop was co-organized by CSEC, a special interest group on computer security of the IPSJ (Information Processing Society of Japan) and ISEC, a technical group on information security of IEICE (The Institute of Electronics, Information and Communication Engineers). The excellent Local Organizing Committee was led by the IWSEC 2009 General Co-chairs, Kazuo Takaragi and Hiroaki Kikuchi. IWSEC2009received46papersubmissionsfromallovertheworld.Wewould like to thank all the authors who submitted papers. Eachpaper was reviewedby at least three reviewers. In addition to the Program Committee members, many externalreviewersjoinedthereviewprocessintheirparticularareasofexpertise. We were fortunate to have this energetic team of experts, and are grateful to all of them for their hard work. The hard work includes very active discussion; the discussion phase was almost as long as the initial individual reviewing. The review and discussion were supported by a very nice Web-based system, iChair. We thank its developers. Following the review phases, 13 papers were accepted for publication in this volume of Advances in Information and Computer Security. Together with the contributed papers, the workshop featured an invited talk and a hash function panel both of which were respectively given and chaired by eminent researcher, Bart Preneel (Katholieke Universiteit Leuven). An abstract of the talk, titled "TheFutureofCryptographicAlgorithms,"isincludedinthisvolume.Wedeeply appreciate his contribution. Many people contributed to the success of IWSEC 2009. We wish to - press our deep appreciation for their contribution to information and computer security.