INFORMATION PROCESSING DEVICE AND INFORMATION PROCESSING SYSTEM

Title:

INFORMATION PROCESSING DEVICE AND INFORMATION PROCESSING SYSTEM

Document Type and Number:

WIPO Patent Application WO/2023/145240

Kind Code:

A1

Abstract:

In response to a data cryptographic key use request from a first device (100), a management unit (300) transmits a data cryptographic key to a first device (100) via a secure environment between the management unit (300) and the first device (100) only when the integrity of a first application running in an isolated calculation region (150) is verified. The first device (100) uses the data cryptographic key to encrypt target data via the first application and transmits the encrypted target data to a second device (200). In response to a data cryptographic key use request from the second device (200), the management unit (300) transmits a data cryptographic key to the second device (200) via a secure environment between the management unit (300) and the second device (200) only when the integrity of a second application running in an isolated calculation region (250) is verified. The second device (200) uses the data cryptographic key to decrypt the encrypted target data via the second application.

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Inventors:

HASEGAWA KEITA (JP)
NOZAWA KAZUMA (JP)
DOUMEN TAKUYA (JP)
NAKAGAWA TOMOHIRO (JP)
AONO HIROSHI (JP)
TERADA MASAYUKI (JP)

Application Number:

PCT/JP2022/043941

Publication Date:

August 03, 2023

Filing Date:

November 29, 2022

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Assignee:

NTT DOCOMO INC (JP)

International Classes:

G06F21/53; H04L9/08; G06F21/60; G06F21/64

Foreign References:

JP2020202505A	2020-12-17
JP6795863B1	2020-12-02
JP2011087150A	2011-04-28

Other References:

"Introduction to Cryptography", 25 February 1993, KYORITSU SHUPPAN CO., LTD., JP, ISBN: 4-320-02633-0, article OKAMOTO, EIJI: "6.1.2 Key Hierarchy; 6.1.3 Key Distribution", pages: 110 - 112, XP009548201
AKASHI, OSAMU ET AL.: "Multimedia Information Market System (InfoKet)", NTT RESEARCH AND DEVELOPMENT NTTR & D - NTT R & D : NTT GROUP'S RESEARCH AND DEVELOPMENT ACTIVITIES / NTT SENTAN GIJUTSU SōGō KENKYūSHO, TOKYO, JP, vol. 46, no. 2, 1 February 1997 (1997-02-01), JP , pages 107 - 114, XP009548136, ISSN: 0915-2326

Attorney, Agent or Firm:

HASEGAWA Yoshiki et al. (JP)

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