Cryptography – Cryptanalysis
Patent
1995-11-29
1997-12-23
Cain, David C.
Cryptography
Cryptanalysis
380 21, 380 24, H04L 900
Patent
active
057013438
ABSTRACT:
A digital information protection scheme using an improved security protocol. In a system in which a user makes an access to a digital information provided by an information center by connecting a computer card owned by the user to an information terminal device connected with the information center, a work key for encrypting a desired digital information is delivered from the information center to the computer card through the information terminal device, and the work key is registered in the computer card; the desired digital information encrypted by the work key is delivered from the information center to the information terminal device; and an encrypted digital information delivered from the information center is decrypted at the information terminal device by using the work key registered in the computer card, and a decrypted digital information is provided to the user at the information terminal device.
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Ishii Shinji
Takashima Youichi
Yamanaka Kiyoshi
Cain David C.
Nippon Telegraph & Telephone Corporation
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