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1. WO2020141584 - MANAGEMENT SYSTEM AND PROGRAM

Publication Number WO/2020/141584
Publication Date 09.07.2020
International Application No. PCT/JP2019/047339
International Filing Date 04.12.2019
IPC
H04L 9/08 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Arrangements for secret or secure communication
08Key distribution
H04L 9/14 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Arrangements for secret or secure communication
14using a plurality of keys or algorithms
G06F 21/60 2013.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
21Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
60Protecting data
G06F 21/62 2013.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
21Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
60Protecting data
62Protecting access to data via a platform, e.g. using keys or access control rules
CPC
G06F 21/60
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
21Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
60Protecting data
G06F 21/62
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
21Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
60Protecting data
62Protecting access to data via a platform, e.g. using keys or access control rules
H04L 9/08
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Cryptographic mechanisms or cryptographic; arrangements for secret or secure communication
08Key distribution ; or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
H04L 9/14
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
9Cryptographic mechanisms or cryptographic; arrangements for secret or secure communication
14using a plurality of keys or algorithms
Applicants
  • 株式会社フューチャーアイ KABUSIKIGAISYAFUTUREEYE [JP]/[JP]
Inventors
  • 塚本 豊 TSUKAMOTO Yutaka
  • 塚本 陽子 TSUKAMOTO Yoko
Priority Data
2019-00037106.01.2019JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) MANAGEMENT SYSTEM AND PROGRAM
(FR) SYSTÈME ET PROGRAMME DE GESTION
(JA) 処理システムおよびプログラム
Abstract
(EN)
[Problem] To resolve the dilemma of the tradeoff between ensuring the truth of recorded information and ensuring the right to delete the information. [Solution] Information is double-encoded EKA(EKB(information)) using two counterpart common keys KA and KB, and is recorded in a blockchain. An information holder distributes one counterpart common key KB to an information requester, and transmits information EKB(information) to the information requester, the information being obtained by decoding DKA(EKA(EKB (information))) the double-encoded information using the counterpart key KA. The information requester calculates DKB(EKB(information)) to obtain plain-text information. The information holder updates the counterpart common key KA to R, whereby even if DR (EKA (EKB (information))) is transmitted to the information requester and the information requester performs decoding DKB(DR(EKA(EKB (information)))) using KB, it is not possible to obtain the plain text.
(FR)
La présente invention vise à mettre fin au dilemme lié au compromis entre la garantie de la véracité de l'information enregistrée et la garantie du droit de suppression de l'information. À cet effet, l'information est codée deux fois EKA(EKB(information)) en utilisant deux clés de contrepartie communes KA et KB avant d'être enregistrée dans une chaîne de blocs. Un détenteur d'information distribue une clé de contrepartie commune KB à un demandeur d'information puis transmet l'information EKB(information) au demandeur d'information, l'information étant obtenue en décodant DKA(EKA(EKB (information))) l'information codée deux fois en utilisant la clé de contrepartie KA. Le demandeur d'information calcule DKB(EKB(information)) de façon à obtenir une information de texte en clair. Le détenteur d'information met à jour la clé de contrepartie commune KA à R de sorte que, même si DR (EKA (EKB (information))) est transmise au demandeur d'information et si le demandeur d'information effectue un décodage de DKB(DR(EKA(EKB (information)))) en utilisant KB, il ne peut obtenir le texte en clair.
(JA)
【課題】記録された情報の真正の保証とその情報の削除権の保証とが二律背反するジレンマを解消する。 【解決手段】2つの片割れ共通鍵KA及びKBで情報を二重暗号化EKA(EKB(情報))してブロックチェーンに記録する。情報保持者は、情報要求者に対し、一方の片割れ共通鍵KBを配布すると共に二重暗号化された情報を片割れ鍵KAで復号DKA(EKA(EKB(情報)))した情報EKB(情報)を送信する。情報要求者はDKB(EKB(情報))を演算して平文の情報を得る。情報保持者が片割れ共通鍵KAをRに更新することにより、情報要求者に対しD(EKA(EKB(情報)))が送信され、情報要求者がKBで復号DKB(D(EKA(EKB(情報)))しても、平文を得ることができなくする。
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