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Symmetric collective attacks for the eavesdropping of symmetric quantum key distribution

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JournalINTERNATIONAL JOURNAL OF QUANTUM INFORMATION
DatePublished - Jul 2008
Issue numberSUPL.
Volume6
Number of pages7
Pages (from-to)765-771
Original languageEnglish

Abstract

We consider the collective eavesdropping of the BB84 and six-state protocols. Since these protocols are symmetric in the eigenstates of conjugate bases, we consider collective attacks having the same kind of symmetry. We then show how these symmetric collective attacks are sufficiently strong in order to minimize the Devetak-Winter rates. In fact, it is quite easy to construct simple examples able to reach the unconditionally secure key rates of these protocols.

    Research areas

  • quantum cryptography, unconditional security, collective attacks, CRYPTOGRAPHY, STATES

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