Ic Card for Encryption or Decryption Process and Encrypted Communication System and Encrypted Communication Method Using the Same

US20070226513A1Inactive Publication Date: 2007-09-27DAI NIPPON PRINTING CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
DAI NIPPON PRINTING CO LTD
Publication Date
2007-09-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

It is possible to perform encrypted communication between members of a group while assuring a sufficient security compatible with a change of the members. An IC card having the same fixed code F(a) is distributed to all the staffs of company A. When communication is performed between a staff α and a staff β belonging to the same project group, α of the transmission side writes an arbitrary variable code V(1) in the IC card (100a) so as to generate encryption key information K(a1) according to F(a) and V(1) in the IC card and encrypt data D1 by using K(a1). β of the reception side writes the variable code V(1) received from a in the IC card (100b) so as to generate encryption key information K(a1). By using this K(a1), the encrypted data D2 received is decrypted to obtain data D3. The fixed code F(a) is different for each of the companies and rewrite-disabled so as to assure security.
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Description

TECHNICAL FIELD

[0001] The present invention relates to an encrypted communication system and an encrypted communication method, and particularly relates to arts of performing encrypted communication using an IC card which executes an encryption or a decryption process. BACKGROUND ART

[0002] With the spread of computer networks in recent years, encrypted communication arts have become extremely important and essential. In a general encrypted communication method, data to be subject to transmission is encrypted at a transmitter side and transmitted as encrypted text data to a receiver side, and at the receiver side, the transmitted encrypted text data is decrypted to obtain the original data subject to transmission. Thus to perform encrypted communication between the two sides, in addition to providing means for sending and receiving data, a means for executing an encryption process must be provided at the transmitter side and a means for executing a decryption process must be provid...

Claims

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