Threshold quantum cryptography

Yuuki Tokunaga, Tatsuaki Okamoto, and Nobuyuki Imoto
Phys. Rev. A 71, 012314 – Published 10 January 2005

Abstract

We present the concept of threshold collaborative unitary transformation or threshold quantum cryptography, which is a kind of quantum version of threshold cryptography. Threshold quantum cryptography states that classical shared secrets are distributed to several parties and a subset of them, whose number is greater than a threshold, collaborates to compute a quantum cryptographic function, while keeping each share secretly inside each party. The shared secrets are reusable if no cheating is detected. As a concrete example of this concept, we show a distributed protocol (with threshold) of conjugate coding.

  • Received 9 August 2004

DOI:https://doi.org/10.1103/PhysRevA.71.012314

©2005 American Physical Society

Authors & Affiliations

Yuuki Tokunaga1,2,*, Tatsuaki Okamoto1, and Nobuyuki Imoto2

  • 1NTT Information Sharing Platform Laboratories, NTT Corporation, 1-1 Hikari-no-oka, Yokosuka, Kanagawa 239-0847, Japan
  • 2Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

  • *Electronic address: tokunaga.yuuki@lab.ntt.co.jp

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Vol. 71, Iss. 1 — January 2005

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