Informationsverarbeitungssystem, Informationsverarbeitungsverfahren und Computerlesbares Nichttransitorisches Speichermedium

Details

Veröffentlichungs-Nr.

EP4800590

Anmeldetag

10. Februar 2026

Veröffentlichung

2. September 2026

Rechtsraum

EP

IPC

G06F21/60, H04L9/08

Abstract

A first secure server: encrypts a data encryption key with a unique key unique to the first secure server; stores the encrypted unique key therein; generates a first ciphertext obtained by encrypting the data encryption key with a first shared key; transmits the first ciphertext to the second secure server; generate a second ciphertext obtained by encrypting an escrow target data with the data encryption key; stores the second ciphertext in the first secure server therein; and outputs duplicated data of the second ciphertext, and a second secure server: decrypts the first ciphertext received from the first secure server with the first shared key to extract the data encryption key; generates a third ciphertext obtained by encrypting the extracted data encryption key with a private key; stores the third ciphertext therein; and delete the private key therefrom.

Anmelder

Firma

Hitachi, Ltd.

Land

🇯🇵 Japan

Fachgebiete