Omer Reingold

This book constitutes the refereed proceedings of the Sixth Theory of Cryptography Conference, TCC 2009, held in San Francisco, CA, USA, March 15-17, 2009. The 33 revised full papers presented together with two invited talks were carefully reviewed and selected from 109 submissions. The papers are organized in 10 sessions dealing with the paradigms, approaches and techniques used to conceptualize, define and provide solutions to natural cryptographic problems.

Sixth Theory of Cryptography Conference, TCC 2009, San Francisco, CA, USA, March 15-17, 2009, Proceedings

Theory of Cryptography

TCC 2009, the 6th Theory of Cryptography Conference, was held in San Fr- cisco, CA, USA, March 15–17, 2009. TCC 2009 was sponsored by the Inter- tional Association for Cryptologic Research (IACR) and was organized in - operation with the Applied Crypto Group at Stanford University. The General Chair of the conference was Dan Boneh. The conference received 109 submissions, of which the Program Comm- tee selected 33 for presentation at the conference. These proceedings consist of revised versions of those 33 papers. The revisions were not reviewed, and the authors bear full responsibility for the contents of their papers. The conference program also included two invited talks: “The Di?erential Privacy Frontier,” given by Cynthia Dwork and “Some Recent Progress in Lattice-Based Crypt- raphy,” given by Chris Peikert. I thank the Steering Committee of TCC for entrusting me with the resp- sibility for the TCC 2009 program. I thank the authors of submitted papers for their contributions. The general impression of the Program Committee is that the submissions were of very high quality, and there were many more papers we wanted to accept than we could. The review process was therefore very - warding but the selection was very delicate and challenging. I am grateful for the dedication, thoroughness,and expertise ofthe ProgramCommittee. Obse- ing the way the members of the committee operated makes me as con?dent as possible of the outcome of our selection process.

Klaus Jansen

José D.P. Rolim

Moses Charikar

This volume presents the refereed proceedings of the 10th International Workshop on Approximation Algorithms for Combinatorial Optimization Problems and the 11th International Workshop on Randomization and Computation. The papers cover design and analysis of approximation algorithms, hardness of approximation, small space and data streaming algorithms, sub-linear time algorithms, embeddings and metric space methods, and much more.

Omer Reingold

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