MANAGEMENT SYSTEM AND PROGRAM

WIPO Patent Application WO/2020/141584

A1

[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.

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TSUKAMOTO YUTAKA (JP)
TSUKAMOTO YOKO (JP)

PCT/JP2019/047339

July 09, 2020

December 04, 2019

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KABUSIKIGAISYAFUTUREEYE (JP)

H04L9/08; G06F21/60; G06F21/62; H04L9/14

WO1995009410A1

1995-04-06

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