It was a pleasure to take part in the 2005 European Workshop on Security and Privacy in Ad Hoc and Sensor Networks (ESAS 2005), held on July 13-14 in Visegrad (Hungary) in conjunction with the First International Conference on Wireless Internet (WICON) . As Program Co-chairs, we are very happy with the outcome of this year's ESAS workshop. It clearly demonstrates the continued importance, popularity andtimeliness oftheworkshop'stopic: securityandprivacy inadhocandsensor networks.Atotalof51fullpapersweresubmitted.Eachsubmissionwasreviewed by at least three expert referees. After a short period of intense discussions and deliberations, the Program Committee selected 17 papers for presentation and subsequent publication in the workshop proceedings. This corresponds to an acceptance rate of 33% - a respectable rate by any measure. First and foremost, we thank the authors of ALL submitted papers. Your con?dence in this venue is much appreciated. We hope that you will continue patronizing ESAS as authors and attendees. We are also very grateful to our colleagues in the research community who served on the ESAS Program C- mittee. Your sel?ess dedication is what makes the workshop a success. Finally, we are very grateful to the ESAS Steering Group: Levente Buttyan, Claude Castelluccia, Dirk Westho? and Susanne Wetzel. They had the vision and the drive to create this workshopin the ?rst place; they also provided many insightsandlotsofhelpwiththisyear'sevent.Weespeciallyacknowledgeand- preciate the work of Levente Buttyan whose dedication (as Steering Committee member, PC member and Local Arrangements Chair) played a very important role in the success of the workshop.

ForewordfromtheProgramChairs These proceedings contain the papers selected for presentation at the 9th - ropean Symposium on Research in Computer Security (ESORICS), held during September 13 15, 2004 in Sophia Antipolis, France. In response to the call for papers 159 papers were submitted to the conference. These papers were evaluated on the basis of their signi?cance, novelty, and te- nicalquality. Eachpaper wasreviewedby at leastthree members of the program committee. The program committee meeting was held electronically; there was an intensive discussion over a period of two weeks. Of the papers submitted, 27 were selected for presentation at the conference, giving an acceptance rate lower than 17%. The conference program also included an invited talk. A workshop like this does not just happen; it depends on the volunteer e?orts of ahostofindividuals. Thereisalonglistofpeoplewhovolunteeredtheirtimeand energy to put together the workshopand who deserve special thanks. Thanks to all the members of the program committee, and the external reviewers, for all their hardwork in the paper evaluation. Due to the large number of submissions the program committee members were really required to work hard in a short time frame, and we are very thankful to them for the commitment they showed with their active participation in the electronic discussion."

This book constitutes the proceedings of the 11th International Conference on Network and System Security, NSS 2017, held in Helsinki, Finland, in August 2017. The 24 revised full papers presented in this book were carefully reviewed and selected from 83 initial submissions. The papers are organized in topical sections on Cloud and IoT Security; Network Security; Platform and Hardware Security; Crypto and Others; and Authentication and Key Management. This volume also contains 35 contributions of the following workshops: Security Measurements of Cyber Networks (SMCN-2017); Security in Big Data (SECBD-2017); 5G Security and Machine Learning (IW5GS-2017); of the Internet of Everything (SECIOE-2017).