Locally Decodable Codes and Private Information Retrieval Schemes

Locally Decodable Codes and Private Information Retrieval Schemes

by Sergey Yekhanin


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Locally Decodable Codes and Private Information Retrieval Schemes by Sergey Yekhanin

Locally decodable codes (LDCs) are codes that simultaneously provide efficient random access retrieval and high noise resilience by allowing reliable reconstruction of an arbitrary bit of a message by looking at only a small number of randomly chosen codeword bits. Local decodability comes with a certain loss in terms of efficiency – specifically, locally decodable codes require longer codeword lengths than their classical counterparts. Private information retrieval (PIR) schemes are cryptographic protocols designed to safeguard the privacy of database users. They allow clients to retrieve records from public databases while completely hiding the identity of the retrieved records from database owners.

In this book the author provides a fresh algebraic look at the theory of locally decodable codes and private information retrieval schemes, obtaining new families of each which have much better parameters than those of previously known constructions, and he also proves limitations of two server PIRs in a restricted setting that covers all currently known schemes. The author's related thesis won the ACM Dissertation Award in 2007, and this book includes some expanded sections and proofs, and notes on recent developments.

Product Details

ISBN-13: 9783642265778
Publisher: Springer Berlin Heidelberg
Publication date: 12/27/2012
Series: Information Security and Cryptography
Edition description: 2010
Pages: 82
Product dimensions: 6.10(w) x 9.25(h) x 0.01(d)

Table of Contents

Locally decodable codes via the point removal method.- Limitations of the point removal method.- Private information retrieval.

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