公开(公告)号：EP0891055A3

公开(公告)日：2001-09-05

申请号：EP98302486.0

申请日：1998-03-31

申请人： FUJITSU LIMITED ,  NEC Corporation ,  Hitachi, Ltd.

发明人： Morita, Ichirou, c/o Fujitsu Limited ,  Kuroda, Yasutsugu, c/o Fujitsu Limited ,  Torii, Naoya, c/o Fujitsu Limited ,  Yamazaki, Masashi ,  Miyauchi, Hiroshi ,  Sako, Kazue ,  Domyo, Seiichi ,  Tsuchiya, Hiroyoshi ,  Kanno, Seiko

IPC分类号： H04L9/08

CPC分类号： H04L9/3226 ,  H04L9/0897

摘要： A key recovery information distribution device is provided between a recoverer device and a key recovery device, recovers a data key for the recoverer device, and reduces the load of the recoverer device. Data is encrypted using the data key and stored with key recovery information. The recoverer device which decrypts the encrypted data distributes the key recovery information to key recovery devices through the key recovery information distribution device to recover key information. A recoverer is authenticated directly between the key recovery device and the recoverer device, and then the key information is transmitted to the recoverer device, and the recoverer device recovers the data key.

公开(公告)号：EP1093069A3

公开(公告)日：2004-03-03

申请号：EP00307111.5

申请日：2000-08-18

申请人： FUJITSU LIMITED

发明人： Kuroda, Yasutsugu, c/o Fujitsu Limited ,  Yoshioka, Takashi, c/o Fujitsu Limited ,  Ono, Etsuo, c/o Fujitsu Limited

IPC分类号： H04L9/32 ,  G06F1/00

CPC分类号： G06Q10/10 ,  H04L9/3247 ,  Y10S707/99931 ,  Y10S707/99932 ,  Y10S707/99939

摘要： An electronic document is registered as electronic original data in an apparatus (11) different from the computer environment (12) of a user. At this time, a registration certificate for uniquely identifying the electronic original data (14) is issued, and the user accesses the electronic original data using the issued registration certificate. This allows authenticity of an electronic document to be ensured, and copies or forgeries to be detected.