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Secret communication method and secret communication device thereof

外国特許コード F120006710
整理番号 BE06201GB1
掲載日 2012年5月28日
出願国 英国
出願番号 201111098
公報番号 2479288
公報番号 2479288
出願日 平成19年6月20日(2007.6.20)
公報発行日 平成23年10月5日(2011.10.5)
公報発行日 平成24年3月28日(2012.3.28)
優先権データ
  • 20090000546 (2007.6.20) GB
  • 特願2006-203984 (2006.7.26) JP
  • 特願2006-203985 (2006.7.26) JP
発明の名称 (英語) Secret communication method and secret communication device thereof
発明の概要(英語)

This invention finds particular application in the field of quantum cryptography. A sender and receiver each determine an initial random number, X and Y respectively. These initial random numbers are to be used for encryption and decryption of data. The random numbers are correlated but not identical. The degree of mismatch between them is measured as an error ratio 204, from which an encoding ratio is deduced. Furthermore an estimate is made of the extent to which the initial random numbers can be compromised by eavesdropping 219. In order to counteract eavesdropping an encryption function for encrypting data to be transmitted over a public communication path 210 includes a confidentiality matrix C, such as a Toeplitz matrix comprising random numbers. The dimensions of the confidentiality matrix are determined by the expected extent of eavesdropping.

Preferably encryption 207 is performed using the matrix equation on page 83, where Z is the ciphertext, M is the cleartext, D is a further random number generated 205 by the sender and F takes account of an error correction code (see page 38). Preferably the message is decrypted 217 using the equation on page 54, where g is an error correction decoding function. Confidentiality increase matrices may be exchanged between sender and receiver (213, claim 8) or generated by both sender and receiver.

  • 出願人(英語)
  • JAPAN SCIENCE & TECHNOLOGY AGENCY
  • 発明者(英語)
  • MASAHITO HAYASHI
国際特許分類(IPC)
参考情報 (研究プロジェクト等) ERATO/SORST Quantum Computation and Inforamtion AREA
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