Theory of Cryptography Second Theory of Cryptography Conference, TCC

TCC 2005, the 2nd Annual Theory of Cryptography Conference, was held in Cambridge,Massachusetts,onFebruary10–12,2005.Theconferencereceived84 submissions,ofwhichtheprogramcommitteeselected32forpresentation.These proceedings contain the revised versions of

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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 New York University, NY, 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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Joe Kilian (Ed.)

Theory of Cryptography Second Theory of Cryptography Conference, TCC 2005 Cambridge, MA, USA, February 10-12, 2005 Proceedings

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Volume Editor Joe Kilian Yianilos Labs 707 State Rd., Rt. 206, Suite 212, Princeton, NJ 08540, USA E-mail: [email protected]

Library of Congress Control Number: 2005920136 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 ISSN 0302-9743 ISBN 3-540-24573-1 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 springeronline.com © Springer-Verlag Berlin Heidelberg 2005 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper SPIN: 11390305 06/3142 543210

Preface

TCC 2005, the 2nd Annual Theory of Cryptography Conference, was held in Cambridge, Massachusetts, on February 10–12, 2005. The conference received 84 submissions, of which the program committee selected 32 for presentation. These proceedings contain the revised versions of the submissions that were presented at the conference. These revisions have not been checked for correctness, and the authors bear full responsibility for the contents of their papers. The conference program also included a panel discussion on the future of theoretical cryptography and its relationship to the real world (whatever that is). It also included the traditional “rump session,” featuring short, informal talks on late-breaking research news. Much as hatters of old faced mercury-induced neurological damage as an occupational hazard, computer scientists will on rare occasion be afflicted with eg