These proceedings contain the papers selected for presentation at the 13th European Symposium on Research in Computer Security--ESORICS 2008--held October 6-8, 2008 in Torremolinos (Malaga), Spain, and hosted by the University of Malaga, C- puter Science Department. ESORICS has become the European research event in computer security. The symposium started in 1990 and has been organized on alternate years in different European countries. From 2002 it has taken place yearly. It attracts an international audience from both the academic and industrial communities. In response to the call for papers, 168 papers were submitted to the symposium. These papers were evaluated on the basis of their significance, novelty, and technical quality. Each paper was reviewed by at least three members of the Program Comm- tee. The Program Committee meeting was held electronically, holding intensive d- cussion over a period of two weeks. Finally, 37 papers were selected for presentation at the symposium, giving an acceptance rate of 22%.

QUANTUMCOMM 2009--the International Conference on Quantum Communi- tion and Quantum Networking (from satellite to nanoscale)--took place in Vico Equense near Naples, Italy, during October 26-30, 2009. The conference made a significant step toward stimulating direct dialogue between the communities of quantum physics and quantum information researchers who work with photons, atoms, and electrons in pursuit of the common goal of investigating and utilizing the transfer of physical information between quantum systems. This meeting brought together experts in quantum communication, quantum inf- mation processing, quantum nanoscale physics, quantum photonics, and networking. In the light of traditional approaches to quantum information processing, quantum communication mainly deals with encoding and securely distributing quantum states of light in optical fiber or in free space in order to provide the technical means for quantum cryptography applications. Exciting advances in the area of quantum c- munication over the last decade have made the metropolitan quantum network a re- ity. Several papers presented at this meeting have demonstrated that quantum crypt- raphy is approaching the point of becoming a high-tech application rather than a - search subject. The natural distance limitation of quantum cryptography has been significantly augmented using ideas of global quantum communication with stab- orbit satellites. The results presented at this conference demonstrated that practical secure satellite communication is clearly within reach.

The 8th International Conference on Cryptology and Network Security (CANS 2009) was held at the Ishikawa Prefectural Museum of Art in Kanazawa, Japan, during December 12-14, 2009. The conference was jointly co-organized by the NationalInstituteofAdvancedIndustrialScienceandTechnology(AIST), Japan, and the Japan Advanced Institute of Science and Technology (JAIST). In ad- tion, the event was supported by the Special Interest Group on Computer Se- rity (CSEC), IPSJ, Japan, the Japan Technical Group on Information Security (ISEC), IEICE, the Japan Technical Committee on Information and Com- nication System Security(ICSS), IEICE, and the Society of Information Theory and its Applications (SITA), Japan, and co-sponsored by the National Ins- tute of Information and Communications Technology, Japan, ComWorth Co., LTD, Japan, Hitachi, Ltd., Hokuriku Telecommunication Network Co., Inc., and Internet Initiative Japan Inc. The conference received 109 submissions from 24 countries, out of which 32 were accepted for publication in these proceedings. At least three Program Committee (PC) members reviewed each submitted paper, while submissions co-authored by a PC member were submitted to the more stringent evaluation of ?ve PC members. In addition to the PC members, many external reviewers joinedthereviewprocessintheirparticularareasofexpertise. Wewerefortunate to have this energetic team of experts, and are deeply grateful to all of them for their hard work, which included a very active discussion phase-almost as long as the initial individual reviewing period. The paper submission, review and discussion processes were e?ectively and e?ciently made possible by the Web-based system iChair.

th It is our great pleasure to present this volume of the proceedings of the 10 edition of Information Hiding (IH 2008). The conference was held in Santa Barbara - the Ame- can Riviera, California, USA, during May 19-21, 2008. It was organized by three Santa Barbarans on fire, from both industry (Mayachitra) and academia (UCSB). Over the years, Information Hiding (IH) has established itself as a premier forum for presenting research covering various aspects of information hiding. Continuing the tradition, this year, we provide a balanced program including topics such as anonymity and privacy, forensics, steganography, watermarking, fingerprinting, other hiding domains, and novel applications. We received a total of 64 papers from all over the globe, and would like to take this opportunity to thank all the authors who submitted their paper to IH 2008 and thus contributed to the consolidation of the reputation of the conference. The papers were refereed by at least three revi- ers who provided detailed comments, which was followed by discussion amongst the Program Committee members. Only 25 papers were selected for presentation. This rigorous review process will certainly strengthen Information Hiding's po- tion as the top forum of our community.

The 16th Workshop on Selected Areas in Cryptography (SAC 2009) was held at the University of Calgary,in Calgary, Alberta, Canada, during August 13-14, 2009. There were 74 participants from 19 countries. Previous workshops in this series were held at Queens University in Kingston (1994, 1996, 1998, 1999, and 2005), Carleton University in Ottawa (1995, 1997, and 2003), University of - terloo (2000 and 2004), Fields Institute in Toronto (2001), Memorial University of Newfoundland in St. Johns (2002), Concordia University in Montreal (2006), University of Ottawa (2007), and Mount Allison University in Sackville (2008). The themes for SAC 2009 were: 1. Design and analysis of symmetric key primitives and cryptosystems, incl- ing block and stream ciphers, hash functions, and MAC algorithms 2. E?cient implementations of symmetric and public key algorithms 3. Mathematical and algorithmic aspects of applied cryptology 4. Privacy enhancing cryptographic systems This included the traditional themes (the ?rst three) together with a special theme for 2009 workshop (fourth theme).

The Second International Conference on Forensic Applications and Techniques in Telecommunications, Information and Multimedia (e-Forensics 2009) took place in Adelaide, South Australia during January 19-21, 2009, at the Australian National Wine Centre, University of Adelaide. In addition to the peer-reviewed academic papers presented in this volume, the c- ference featured a significant number of plenary contributions from recognized - tional and international leaders in digital forensic investigation. Keynote speaker Andy Jones, head of security research at British Telecom, outlined the emerging challenges of investigation as new devices enter the market. These - clude the impact of solid-state memory, ultra-portable devices, and distributed storage - also known as cloud computing. The plenary session on Digital Forensics Practice included Troy O'Malley, Que- sland Police Service, who outlined the paperless case file system now in use in Que- sland, noting that efficiency and efficacy gains in using the system have now meant that police can arrive at a suspect's home before the suspect! Joseph Razik, represe- ing Patrick Perrot of the Institut de Recherche Criminelle de la Gendarmerie Nati- ale, France, summarized research activities in speech, image, video and multimedia at the IRCGN. The plenary session on The Interaction Between Technology and Law brought a legal perspective to the technological challenges of digital forensic investigation.

The Second Annual Workshop on Privacy and Security, organized by the Center for Interdisciplinary Studies in Information Privacy and Security of the School of C- munication and Information at Rutgers University, was held on May 12, 2008 at the Hyatt Regency, New Brunswick, New Jersey, USA. A few of the papers in this volume were produced through a multi-step process. First, we recorded the talk given by each author at the workshop in May 2008. Next, we transcribed the recording. The authors then produced a draft of their paper from these transcriptions, refining each draft until the final version. Although the papers are not verbatim transcriptions of the talks given, some do retain the informal and conv- sational quality of the presentations. In one instance we have included some material from the question-and-answer period after the talk, since the material covered proved to be relevant and interesting. The majority of authors, however, preferred to include a more formal paper based on the material presented at the workshop.

This book contains the best papers of the Third International Conference on Software and Data Technologies (ICSOFT 2008), held in Porto, Portugal, which was organized by the Institute for Systems and Technologies of Information, Communication and Control (INSTICC), co-sponsored by the Workflow Management Coalition (WfMC), in cooperation with the Interdisciplinary Institute for Collaboration and Research on Enterprise Systems and Technology (IICREST). The purpose of ICSOFT 2008 was to bring together researchers, engineers and practitioners interested in information technology and software development. The conference tracks were "Software Engineering", "Information Systems and Data Management", "Programming Languages", "Distributed and Parallel Systems" and "Knowledge Engineering". Being crucial for the development of information systems, software and data te- nologies encompass a large number of research topics and applications: from imp- mentation-related issues to more abstract theoretical aspects of software engineering; from databases and data-warehouses to management information systems and kno- edge-base systems; next to that, distributed systems, pervasive computing, data qu- ity and other related topics are included in the scope of this conference.

Information and communication technologies are advancing fast. Processing speed is still increasing at a high rate, followed by advances in digital storage technology, which double storage capacity every year. Furthermore, communication techno- gies do not lag behind. The Internet has been widely used, as well as wireless te- nologies. With a few mouse clicks, people can communicate with each other around the world. All these advances have great potential to change the way people live, introducing new concepts like ubiquitous computing and ambient intelligence. Technology is becoming present everywhere in the form of smart and sensitive c- puting devices. They are nonintrusive, transparent and hidden in the background, but they collect, process, and share all kinds of information, including user beh- ior, in order to act in an intelligent and adaptive way. These emerging technologies put new requirements on security and data m- agement. As data are accessible anytime anywhere, it becomes much easier to get unauthorized data access. Furthermore, the use of new technologies has brought about some privacy concerns. It becomes simpler to collect, store, and search personal information, thereby endangering people's privacy. Therefore, research in secure data management is gaining importance, attracting the attention of both the data management and the security research communities. The intere- ing problems range from traditional topics, such as, access control and general database security, via privacy protection to new research directions, such as cryptographically enforced access control.

As intelligent autonomous agents and multiagent system applications become more pervasive, it becomes increasingly important to understand the risks associated with using these systems. Incorrect or inappropriate agent behavior can have harmful - fects, including financial cost, loss of data, and injury to humans or systems. For - ample, NASA has proposed missions where multiagent systems, working in space or on other planets, will need to do their own reasoning about safety issues that concern not only themselves but also that of their mission. Likewise, industry is interested in agent systems that can search for new supply opportunities and engage in (semi-) automated negotiations over new supply contracts. These systems should be able to securely negotiate such arrangements and decide which credentials can be requested and which credentials may be disclosed. Such systems may encounter environments that are only partially understood and where they must learn for themselves which aspects of their environment are safe and which are dangerous. Thus, security and safety are two central issues when developing and deploying such systems. We refer to a multiagent system's security as the ability of the system to deal with threats that are intentionally caused by other intelligent agents and/or s- tems, and the system's safety as its ability to deal with any other threats to its goals.

This volume contains the proceedings of the 12th Financial Cryptography and DataSecurityInternationalConference, heldinCozumel, Mexico, January28-31 2008. Financial cryptography (FC) and data security has been for years the main international forum for research, advanced development, education, exploration, and debate regarding information assurance in the context of ?nance and commerce. Despite the strong competition from other top-tier related security conf- ences, the Program Committee received a signi?cant number of submissions, indicating a growingacceptance of FC as the premier ?nancialand data security forum. The ProgramCommittee, led by the PCChair Gene Tsudik, achievedan excellent program balance between research, practice, and panel sessions. This year the program included two new additions, namely, a short-paper track and a poster session, both extremely well received. Intimate and colorful by tradition, the high-quality program was not the only attraction of FC. In the past, FC conferences have been held in highly research-synergistic locations such as Tobago, Anguilla, Dominica, Key West, Guadeloupe, Bermuda, and the Grand Cayman. In 2008 we continued this t- dition and the conference was located in sunny Cozumel, Mexico. The ongoing carnival, sailing, submarine trips, and Mayan ruins were just a few of the - merous exciteme

th It is our great pleasure to present in this volume the proceedings of the 7 Inter- tional Workshop on Digital Watermarking (IWDW) which was held in Busan, Korea, during November 10-12, 2008. The workshop was hosted by the by Korea Institute of Information Security and Cryptology (KIISC) and sponsored by MarkAny, BK21 CIST (Korea University), ETRI. Since its birth in the early 1990s, digital watermarking has become a mature e- bling technology for solving security problems associated with multimedia distri- tion schemes. Digital watermarks are now used in applications like broadcast mo- toring, movie fingerprinting, digital rights management, and document authentication, to name but a few. Still, many research challenges remain open, among them security and robustness issues, reversibility, and authentication. Continuing the tradition of previous workshops, IWDW 2008 also featured besides papers dealing with digital watermarking contributions from other related fields, such as steganography, ste- nalysis, and digital forensics. The selection of the program was a challenging task. From more than 62 subm- sions (received from authors in 15 different countries) the Program Committee - lected 36 as regular papers. At this point we would like to thank all the authors who submitted their latest research results to IWDW 2008 and all members of the Program Committee who put significant effort into the review process, assuring a balanced program. In addition to the contributed papers, the workshop featured three invited lectures delivered by Y. Q. Shi, C. -C."

The11thInternationalConferenceonInformationandCommunicationsSecurity (ICICS 2009) was held in Beijing, China during December 14-17, 2009. The ICICS conferenceseriesis anestablished forum that bringstogether people from universities,researchinstitutes, industry and governmentinstitutions, who work in a range of ?elds within information and communications security. The ICICS conferencesgiveattendeestheopportunitytoexchangenewideasandinvestigate developments in the state of the art. In previous years, ICICS has taken place in the UK (2008), China (2007, 2005, 2003, 2001 and 1997), USA (2006), Spain (2004), Singapore (2002), and Australia (1999). On each occasion, as on this one, the proceedings have been published in the Springer LNCS series. In total, 162 manuscripts from 20 countries and districts were submitted to ICICS 2009, and a total of 37 (31 regular papers plus 6 short papers) from 13 countries and districts were accepted (an acceptance rate of 23%). The accepted papers cover a wide range of disciplines within information security and applied cryptography. Each submission to ICICS 2009 was anonymously reviewed by three or four reviewers. We are very grateful to members of the Program C- mittee, which was composed of 44 members from 14 countries; we would like to thank them, as well as all the external referees, for their time and their valuable contributions to the tough and time-consuming reviewing process.

Since the mid 1990s, data hiding has been proposed as an enabling technology for securing multimedia communication, and is now used in various applications including broadcast monitoring, movie fingerprinting, steganography, video indexing and retrieval, and image authentication. Data hiding and cryptographic techniques are often combined to complement each other, thus triggering the development of a new research field of multimedia security. Besides, two related disciplines, steganalysis and data forensics, are increasingly attracting researchers and becoming another new research field of multimedia security. This journal, LNCS Transactions on Data Hiding and Multimedia Security, aims to be a forum for all researchers in these emerging fields, publishing both original and archival research results.

This fourth issue contains five contributions in the area of digital watermarking. The first three papers deal with robust watermarking. The fourth paper introduces a new least distortion linear gain model for halftone image watermarking and the fifth contribution presents an optimal histogram pair based image reversible data hiding scheme.

On behalf of the Program Committee, it is our pleasure to present the p- ceedings of the 12th International Symposium on Recent Advances in Intrusion Detection systems (RAID 2009),which took place in Saint-Malo,France, during September 23-25. As in the past, the symposium brought together leading - searchers and practitioners from academia, government, and industry to discuss intrusion detection research and practice. There were six main sessions prese- ingfullresearchpapersonanomalyandspeci?cation-basedapproaches,malware detection and prevention, network and host intrusion detection and prevention, intrusion detection for mobile devices, and high-performance intrusion det- tion. Furthermore, there was a poster session on emerging research areas and case studies. The RAID 2009ProgramCommittee received59 full paper submissionsfrom all over the world. All submissions were carefully reviewed by independent - viewers on the basis of space, topic, technical assessment, and overall balance. The ?nal selection took place at the Program Committee meeting on May 21 in Oakland, California. In all, 17 papers were selected for presentation and p- lication in the conference proceedings. As a continued feature, the symposium accepted submissions for poster presentations which have been published as - tended abstracts, reporting early-stage research, demonstration of applications, or case studies. Thirty posters were submitted for a numerical review by an independent, three-person sub-committee of the Program Committee based on novelty, description, and evaluation. The sub-committee recommended the - ceptance of 16 of these posters for presentation and publication. The success of RAID 2009 depended on the joint e?ort of many people.

MobiSec 2009 was the first ICST conference on security and privacy in mobile information and communication systems. With the the vast area of mobile technology research and application, the intention behind the creation of MobiSec was to make a small, but unique contribution to build a bridge between top-level research and large scale application of novel kinds of information security for mobile devices and communication.

The papers at MobiSec 2009 dealt with a broad variety of subjects ranging from issues of trust in and security of mobile devices and embedded hardware security, over efficient cryptography for resource-restricted platforms, to advanced applications such as wireless sensor networks, user authentication, and privacy in an environment of autonomously communicating objects. With hindsight a leitmotif emerged from these contributions, which corrobarated the idea behind MobiSec; a set of powerful tools have been created in various branches of the security discipline, which await combined application to build trust and security into mobile (that is, all future) networks, autonomous and personal devices, and pervasive applications

Many people do not realise that mathematics provides the foundation for the devices we use to handle information in the modern world. Most of those who do know probably think that the parts of mathematics involvedare quite 'cl- sical', such as Fourier analysis and di?erential equations. In fact, a great deal of the mathematical background is part of what used to be called 'pure' ma- ematics, indicating that it was created in order to deal with problems that originated within mathematics itself. It has taken many years for mathema- cians to come to terms with this situation, and some of them are still not entirely happy about it. Thisbookisanintegratedintroductionto Coding.Bythis Imeanreplacing symbolic information, such as a sequence of bits or a message written in a naturallanguage, byanother messageusing (possibly) di?erentsymbols.There are three main reasons for doing this: Economy (data compression), Reliability (correction of errors), and Security (cryptography). I have tried to cover each of these three areas in su?cient depth so that the reader can grasp the basic problems and go on to more advanced study. The mathematical theory is introduced in a way that enables the basic problems to bestatedcarefully, butwithoutunnecessaryabstraction.Theprerequisites(sets andfunctions, matrices, ?niteprobability)shouldbefamiliartoanyonewhohas taken a standard course in mathematical methods or discrete mathematics. A course in elementary abstract algebra and/or number theory would be helpful, but the book contains the essential facts, and readers without this background should be able to understand what is going on. vi Thereareafewplaceswherereferenceismadetocomputeralgebrasystems.

These are the proceedings of WAIFI 2008, the second workshop on the Ari- metic of Finite Fields, that was held in Siena, Italy, July 6-9, 2008. The ?rst workshop, WAIFI 2007, which was held in Madrid (Spain), was received quite enthusiasticallybymathematicians, computerscientists, engineersandphysicists who are performing research on ?nite ?eld arithmetic. We believe that there is a need for a workshop series bridging the gap between the mathematical theory of ?nite ?elds and their hardware/software implementations and technical - plications. We hope that the WAIFI workshopseries, which from now on will be held on even years, will help to ?ll this gap. Therewere 34 submissionsto WAIFI 2008, of which the ProgramCommittee selected 16 for presentation. Each submission was reviewed by at least three reviewers. Our thanks go to the Program Committee members for their many contributionsandhardwork.Wearealsogratefultotheexternalreviewerslisted below for their expertise and assistance in the deliberations. In addition to the contributions appearing in these proceedings, the workshop program included an invited lecture given by Amin Shokrollahi. Special compliments go out to Enrico Martinelli, General Co-chair, and to Roberto Giorgi and Sandro Bartolini, local organizers of WAIFI 2008, who broughtthe workshopto Siena, oneofthe mostbeautiful citiesofTuscany, Italy. WAIFI 2008 was organized by the Dipartimento di Ingegneria dell'Informazione of the University of Siena, Italy. The submission and selection of papers were done using the iChair software, developed at EPFL by Thomas Baign eres and Matthieu Finiasz. We also thank Deniz Karakoyunlu for his help in this matter.

th This book contains the best papers of the 5 International Conference on e-Business and Telecommunications (ICETE), which was held in July 2008, in Porto, Portugal. This conference reflects a continuing effort to increase the dissemination of recent research results among professionals who work in the areas of e-business and te- communications. ICETE is a joint international conference integrating four major areas of knowledge that are divided into four corresponding conferences: ICE-B (- ternational Conf. on e-Business), SECRYPT (International Conf. on Security and Cryptography), SIGMAP (Int'l Conf. on Signal Processing and Multimedia) and WINSYS (International Conf. on Wireless Information Systems). The program of this joint conference included several outstanding keynote lectures presented by internationally renowned distinguished researchers who are experts in the various ICETE areas. Their keynote speeches have contributed to heightening the overall quality of the program and significance of the theme of the conference. The conference topic areas define a broad spectrum in the key areas of e-business and telecommunications. This wide-view reporting made ICETE appealing to a global au- ence of engineers, scientists, business practitioners and policy experts. The papers - cepted and presented at the conference demonstrated a number of new and innovative solutions for e-business and telecommunication networks and systems, showing that the technical problems in these closely related fields are challenging and worthwhile - proaching an interdisciplinary perspective such as that promoted by ICETE.

This book constitutes the refereed proceedings of the Third International Conference on Pairing-Based Cryptography, Pairing 2009, held in Palo Alto, CA, USA, in August 2009.

The 16 full papers presented were carefully reviewed and selected from 38 submissions. The papers are organized in topical sections on signature security, curves, pairing computation, non-interactive zero-knowledge systems and applications, group signatures, and protocols.

The book in front of you contains the proceedings of SAC 2008, the 15th - nual Workshop on Selected Areas in Cryptography. SAC 2008 took place during August 14-15 at Mount Allison University, Sackville, New Brunswick, Canada. This was the ?rst time that SAC was hosted in New Brunswick, and the second time in an Atlantic Canadian province. Previous SAC workshops were held at Queen's University in Kingston (1994, 1996, 1998, 1999, and 2005), at Carleton University in Ottawa (1995, 1997, 2003), at the University of Waterloo (2000, 2004), at the Fields Institute in Toronto (2001), at Memorial University of N- foundland at St. John's (2002), at Concordia University in Montreal (2006) and at the University of Ottawa (2007). The intent ofthe workshopseriesis to provide a relaxedatmospherein which researchers in cryptography can present and discuss new work on selected areas of current interest. The SAC workshop series has ?rmly established itself as an international forum for intellectual exchange in cryptological research. Theresponsibilityforchoosingthe venueofeachSACworkshopandappoi- ingtheCo-chairslieswiththeSACOrganizingBoard.TheCo-chairsthenchoose the Program Committee in consultation with the Board. Hence, we would like to expressour gratitudeto the SAC OrganizingBoardfor giving usthe mandate to organize SAC 2008, and for their invaluable feedback while assembling the Program Committee.

The 8th International Conference on Ad-Hoc Networks and Wireless (ADHOC-NOW 2009) was held September 22-25, 2009 in Murcia, Spain. Since ADHOCNOW started as a workshop in 2002, it has become a well-established and well-known international conference dedicated to wireless and mobile c- puting. During the last few years it has been held in Toronto, Canada (2002), Montreal, Canada (2003), Vancouver, Canada (2004), Cancun, Mexico (2005), Ottawa, Canada (2006), Morelia, Mexico (2007) and Sophia Antipolis, France (2008). The conference serves as a forum for interesting discussions on ongoing research and new contributions addressing both experimental and theoretical research in the area of ad hoc networks, mesh networks, sensor networks and vehicular networks. In 2009, we recived 92 submissions from 28 di?erent countries around the globe: Algeria, Australia, Brazil, Canada, China, Egypt, Finland, France, G- many, Greece, India, Iran, Ireland, Italy, Japan, Korea, Luxembourg, Malaysia, Mexico,Norway,Poland,Portugal,Serbia,SouthAfrica,Spain,Tunisia,UKand USA. Of the submitted papers, we selected 24 full papers and 10 short papers for publication in the proceedings and presentation in the conference.

These proceedings contain the papers presented at VoteID 2009, the Second - ternationalConferenceonE-votingandIdentity.TheconferencewasheldinL- embourgduring September 7-8,2009, hostedbythe Universityof Luxembourg. VoteID 2009 built on the success of the 2007 edition held in Bochum. Events have moved on dramatically in the intervening two years: at the time of writing, people are in the streets of Tehran protesting against the claimed outcome of the June12thpresidentialelectionin Iran.Banners bearingthe words"Whereis my vote?" bear testimony to the strength of feeling and the need for elections to be trusted. These events show that the search for high-assurance voting is not a purely academic pursuit but one of very real importance. We hope that VoteID 2009 will help contribute to our understanding of the foundations of democracy. TheProgramCommitteeselected11papersforpresentationattheconference out of a total of 24 submissions. Each submission was reviewed by at least four Program Committee members. The EasyChair conference management system proved instrumental in the reviewing process as well as in the preparation of these proceedings. The selected papers cover a wide range of aspects of voting: proposals for high-assurancevotingsystems, evaluationofexistingsystems, assessmentofp- lic response to electronic voting and legal aspects. The program also included a keynote by Mark Ryan.

This book constitutes the refereed proceedings of the Fourth International Conference on Rough Sets and Knowledge Technology, RSKT 2009, held in Gold Coast, Australia, in July 2009. The 85 revised full papers presented together with 3 keynote papers and 2 special sessions were carefully reviewed and selected from 229 submissions. The papers are organized in topical sections on rough sets and computing, rough sets and data reduction, data mining and knowledge discovery, granular computing and cognitive computing, fuzzy sets and computing, knowledge technology and intelligent systems, computational intelligence and applications, image processing and understanding, and formal concept analysis.

This book contains the proceedings of the 5th European Public Key Infrastr- ture Workshop: Theory and Practice, EuroPKI 2008, which was held on the NTNU campus Gloshaugen in Trondheim, Norway, in June 2008. The EuroPKI workshop series focuses on all research and practice aspects of public key infrastructures, services and applications, and welcomes original research papers and excellent survey contributions from academia, government, and industry. Simplyput, publickeysareeasiertodistributethansecretkeys.Nevertheless, constructing e?ective, practical, secure and low cost means for assuring auth- ticity and validity of public keys used in large-scale networked services remains both a technological and organizational challenge. In a nutshell, this is the PKI problem, and the papers presented herein propose new solutions and insight for these questions. This volume holds 16 refereedpapers including the presentationpaper by the invited speaker P. Landrock. In response to the EuroPKI 2008 call for papers, a total of 37 paper proposalswere received. All submissions underwenta thorough blind review by at least three PC members, resulting in a careful selection and revision of the accepted papers. The authors came from 10 countries: Belgium, Brazil, Canada, Finland, Germany, Japan, Malaysia, Norway, Spain, and the USA.Theacceptedpaperswereorganizedintothe topicalsessions: InvitedTalk, Certi?cates, Authentication, Practice, Signatures, Analysis, and Networks.