Theory of Cryptography 4th Theory of Cryptography Conference, TCC 20

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Editorial Board David Hutchison Lancaster University, UK Takeo Kanade Carnegie Mellon University, Pittsburgh, PA, USA Josef Kittler University of Surrey, Guildford, UK Jon M. Kleinberg Cornell University, Ithaca, NY, USA Friedemann Mattern ETH Zurich, Switzerland John C. Mitchell Stanford University, CA, USA Moni Naor Weizmann Institute of Science, Rehovot, Israel Oscar Nierstrasz University of Bern, Switzerland C. Pandu Rangan Indian Institute of Technology, Madras, India Bernhard Steffen University of Dortmund, Germany Madhu Sudan Massachusetts Institute of Technology, MA, USA Demetri Terzopoulos University of California, Los Angeles, CA, USA Doug Tygar University of California, Berkeley, CA, USA Moshe Y. Vardi Rice University, Houston, TX, USA Gerhard Weikum Max-Planck Institute of Computer Science, Saarbruecken, Germany

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Salil P. Vadhan (Ed.)

Theory of Cryptography 4th Theory of Cryptography Conference, TCC 2007 Amsterdam, The Netherlands, February 21-24, 2007 Proceedings

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Volume Editor Salil P. Vadhan Harvard University Division of Engineering & Applied Sciences (DEAS) 33 Oxford Street, Cambridge, MA 02138, USA E-mail: [email protected]

Library of Congress Control Number: 2007920469 CR Subject Classification (1998): E.3, F.2.1-2, C.2.0, G, D.4.6, K.4.1, K.4.3, K.6.5 LNCS Sublibrary: SL 4 – Security and Cryptology ISSN ISBN-10 ISBN-13

0302-9743 3-540-70935-5 Springer Berlin Heidelberg New York 978-3-540-70935-0 Springer Berlin Heidelberg New York

This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer. Violations are liable to prosecution under the German Copyright Law. Springer is a part of Springer Science+Business Media springer.com © International Association for Cryptologic Research 2007 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper SPIN: 12021475 06/3142 543210

Preface

TCC 2007, the Fourth Theory of Cryptography Conference, was held in Amsterdam, The Netherlands, from February 21 to 24, 2007, at Trippenhuis, the headquarters of the Royal Dutch Academy of Arts and Sciences (KNAW). TCC 2007 was sponsored by the International Association for Cryptologic Research (IACR) and was organized in cooperation with the Cryptology and Information Security Group at CWI, Amsterdam; the Mathematical Institute, Leiden University; and DIAMANT, the Dutch national mathematics cluster for discrete interactive and algorithmic algebra and number theory. The General Chair of the conference was Ronald Cramer. The conference received 118 submissions, of