发明申请
US20070226513A1 Ic Card for Encryption or Decryption Process and Encrypted Communication System and Encrypted Communication Method Using the Same
审中-公开
用于加密或解密过程的IC卡和加密通信系统以及使用它的加密通信方法
- 专利标题： Ic Card for Encryption or Decryption Process and Encrypted Communication System and Encrypted Communication Method Using the Same
- 专利标题（中）： 用于加密或解密过程的IC卡和加密通信系统以及使用它的加密通信方法
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申请号： US11579079申请日： 2005-05-02
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公开(公告)号： US20070226513A1公开(公告)日： 2007-09-27
- 发明人: Fukio Handa , Yoshihiro Yano , Takayuki Chikada , Syouzou Niwata
- 申请人： Fukio Handa , Yoshihiro Yano , Takayuki Chikada , Syouzou Niwata
- 优先权： JP2004-137193 20040506
- 国际申请： PCT/JP05/08657 WO 20050502
- 主分类号： H04L9/08
- IPC分类号： H04L9/08 ; G06K19/10
摘要：
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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