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Simplified high-speed high-distance list decoding for alternant codes

  • D.J. Bernstein

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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    Abstract

    This paper presents a simplified list-decoding algorithm to correct any number w of errors in any alternant code of any length n with any designed distance t+1 over any finite field F_q ; in particular, in the classical Goppa codes used in the McEliece and Niederreiter public-key cryptosystems. The algorithm is efficient for w close to, and in many cases slightly beyond, the F_q Johnson bound J'=n' - sqrt{n'(n'-t-1)} where n'¿=¿n(q-1)/q, assuming t+1¿=¿n'. In the typical case that qn/t in (lg n)^O(1) and that the parent field has (lg n)^O(1) bits, the algorithm uses n(lg n)^O(1) bit operations for w = J' - n/(lg n)^O(1); O(n^ 4.5) bit operations for w = J' + o((lg lg n); and n^O(1) bit operations for w = J' + O((lgn)/lg lg n).
    Original languageEnglish
    Title of host publicationPost-Quantum Cryptography (4th International Workshop, PQCrypto 2011, Taipei, Taiwan, November 29-December 2, 2011. Proceedings)
    EditorsB.Y. Yang
    Place of PublicationBerlin
    PublisherSpringer
    Pages200-216
    ISBN (Print)978-3-642-25404-8
    DOIs
    Publication statusPublished - 2011

    Publication series

    NameLecture Notes in Computer Science
    Volume7071
    ISSN (Print)0302-9743

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