Title:
IC CARD
Document Type and Number:
WIPO Patent Application WO/2005/109740
Kind Code:
A1
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 &agr and a staff β belonging to the same project group, &agr 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 &agr 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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Inventors:
HANDA FUKIO (JP)
YANO YOSHIHIRO (JP)
CHIKADA TAKAYUKI (JP)
NIWATA SYOUZOU (JP)
YANO YOSHIHIRO (JP)
CHIKADA TAKAYUKI (JP)
NIWATA SYOUZOU (JP)
Application Number:
PCT/JP2005/008657
Publication Date:
November 17, 2005
Filing Date:
May 02, 2005
Export Citation:
Assignee:
DAINIPPON PRINTING CO LTD (JP)
HANDA FUKIO (JP)
YANO YOSHIHIRO (JP)
CHIKADA TAKAYUKI (JP)
NIWATA SYOUZOU (JP)
HANDA FUKIO (JP)
YANO YOSHIHIRO (JP)
CHIKADA TAKAYUKI (JP)
NIWATA SYOUZOU (JP)
International Classes:
G06K19/10; H04L9/08; H04L9/10; G09C1/00; (IPC1-7): H04L9/08; H04L9/10; G06K19/10
Foreign References:
| JPH01233851A | 1989-09-19 | |||
| JPH09106445A | 1997-04-22 |
Attorney, Agent or Firm:
Shimura, Hiroshi (6-1 Minamikamata 2-chom, Ohta-ku Tokyo, JP)
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