Title:
DIGITAL INFORMATION COMMUNICATION SYSTEM AND ITS METHOD
Document Type and Number:
Japanese Patent JP3276032
Kind Code:
B2
Abstract:
PURPOSE: To provide a digital information communication system preventing illegal use of information and its method and the digital information communication system in which an information utilizing terminal equipment is not limited and its method.
CONSTITUTION: The system is provided with a card section 1 having a security information storage section 11 storing a user identification number, a card secret key, a user signature key and a center verification key, and connects the card section 1 and a terminal equipment 2 when the terminal equipment 2 requests information from an information center equipment 3, and sends the user identification number stored in the card section 1 to the information center equipment 3 from the terminal equipment 2. Furthermore, the information itself received from the information center equipment 3 is ciphered by using the card secret key and the ciphered information is stored in the terminal equipment 2, the information itself is decoded by using the card secret key when the information itself is in use. Thus, the information is utilized independently of the terminal equipment 2.
Inventors:
Yoshiyoshi Yamanaka
Masato Kanda
Ikuro Oyaizu
Rikuo Takano
Masato Kanda
Ikuro Oyaizu
Rikuo Takano
Application Number:
JP8057094A
Publication Date:
April 22, 2002
Filing Date:
April 19, 1994
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G09C1/00; G06F21/10; G06F21/34; G06F21/60; G06F21/62; G06F21/64; H04L9/06; H04L9/08; H04L9/14; H04L9/32; (IPC1-7): H04L9/08; G09C1/00; H04L9/32
Domestic Patent References:
| JP5947646A | ||||
| JP4155658A | ||||
| JP4306760A |
Other References:
山中喜義，高嶋洋一，小柳津育郎，マルチメディアオンデマンドサービスにおける情報保護システム，ＮＴＴ Ｒ＆Ｄ，日本，１９９５年９月１０日，Ｖｏｌ．４４，Ｎｏ．９，ｐｐ．８１３−８１８
Attorney, Agent or Firm:
Seiko Yoshida