发明名称 |
SERVER DEVICE AND PROGRAM |
摘要 |
A server apparatus according to an embodiment generates a random number on receiving from a user apparatus a notification showing that a re-encryption key should be updated, and calculates re-encryption key data on the basis of the re-encryption key stored and the random number generated. The server apparatus transmits the re-encryption key to the user apparatus and receives, from the user apparatus, the user private key not updated yet and re-encryption key updating data calculated from the re-encryption key data on the basis of the user private key updated. The server apparatus calculates the re-encryption key updated, on the basis of the re-encryption key updating data and the random number, and replaces the re-encryption key stored in the storage device with the updated re-encryption key. |
申请公布号 |
EP2763345(B1) |
申请公布日期 |
2016.10.26 |
申请号 |
EP20120837131 |
申请日期 |
2012.09.19 |
申请人 |
KABUSHIKI KAISHA TOSHIBA;TOSHIBA SOLUTIONS CORPORATION |
发明人 |
HAYASHI, RYOTARO;MATSUSHITA, TATSUYUKI;FUJII, YOSHIHIRO;YOSHIDA, TAKUYA;OKADA, KOJI |
分类号 |
H04L9/08;G09C1/00;H04L9/14;H04L29/06 |
主分类号 |
H04L9/08 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|