外部記憶装置、暗号化ユニット装置、復号化ユニット装置、暗号化システム、復号化システム、暗号化方法及び復号化方法

Japanese Patent JP3625356

B2

PROBLEM TO BE SOLVED: To prevent unauthorized copying by a third person by respectively ciphering a data ciphering key for ciphering data by a prescribed master key and the data ciphering key itself and then recording it inside an external storage device corresponding to identification information imparted to the data. SOLUTION: The identification information ID of the data of a ciphering object is generated in this external storage device (IC card 100) and the data ciphering key Sk1 used for the ciphering of the data is generated. Then, the identification information ID, the data ciphering key Sk1 respectively ciphered by the plural master keys stored in the form of being kept secret from the outside and the data ciphering key ciphered by the data ciphering key Sk1 itself are recorded inside the device in correspondence and the data ciphering key Sk1 is safely reported from the IC card 100 through the CPU bus 116 of a computer to this ciphering unit 126 without being obtained from the outside. In the ciphering unit device 126, the data are ciphered by using the data ciphering key Sk1.

Takehisa Kato
Naoki Endo
Akio Tanaka
Nobuhiro Yoshida

JP10228897A

March 02, 2005

April 18, 1997

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Toshiba Corporation

G06F12/14; G06F21/10; G06F21/60; G06F21/62; G06F21/72; G09C1/00; G11B20/10; H04L9/08; H04L9/10; (IPC1-7): G06F12/14; G11B20/10; H04L9/08; H04L9/10

JP5257816A
JP6187510A
JP8044632A
JP9034841A

“DVD-ROM装置用の標準インタフェースが固まる”,日経エレクトロニクス,日経BP社,1996年11月18日,No.676,pp.13,14

Takehiko Suzue
Sadao Muramatsu
Atsushi Tsuboi
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura
Shoji Kawai

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