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1. (WO2014199474) HIGH-SECURITY COMMUNICATION SYSTEM, AND TRANSMITTER AND RECEIVER BOTH USED THEREIN

Pub. No.:    WO/2014/199474    International Application No.:    PCT/JP2013/066268
Publication Date: Fri Dec 19 00:59:59 CET 2014 International Filing Date: Thu Jun 13 01:59:59 CEST 2013
IPC: H04L 9/08
H04K 1/02
Applicants: HITACHI, LTD.
株式会社日立製作所
Inventors: TOMARU Tatsuya
戸丸 辰也
Title: HIGH-SECURITY COMMUNICATION SYSTEM, AND TRANSMITTER AND RECEIVER BOTH USED THEREIN
Abstract:
The objective of the invention is to provide an encoding method and a communication method wherein a bit error correction is easy for an authorized recipient but difficult for an unauthorized recipient. A transmission path along which bit errors are moderately controlled is used to transmit/receive a random number sequence. A common key is shared by a transmitter and a receiver in advance; the bit values of the common key are caused to correspond to the respective slots of the random number sequence; the common key is used to divide the random number sequence into two or more random number system sequences on the basis of the correspondences; and for each of the random number system sequences, an encoding is performed and a parity check signal is generated. The unit of the encoding is equal to or greater than the length of the common key so as to make a segment analysis by an unauthorized recipient impossible.