Title:
暗号化データ管理システム及び方法、記憶媒体
Document Type and Number:
Japanese Patent JP4614377
Kind Code:
B2
Abstract:
A data management system for managing data on a network in which a client device which requests data management transmits encrypted data obtained by encrypting data by a key for the client device, then a server device receives the encrypted data and stores multi-encrypted data obtained by encrypting the encrypted data by a key for the server device. The client device and the server device respectively have a key encrypted by a key for an authentication management device, and the devices can decrypt the key for the client device and the key for the server device and refer to the decrypted keys by referring to the key for the authentication management device. In this arrangement, when reference to the key for the authentication management device is disabled, the key for the server device cannot be referred to, accordingly, the encrypted data cannot be obtained by decrypting the multi-encrypted data. Further, as the key for the client device cannot be referred to, the data cannot be obtained by decrypting the encrypted data. Accordingly, the disabled reference to the key for the authentication management device is equivalent to disposal of the data.
Inventors:
Fukuda Yasuo
Application Number:
JP2000056146A
Publication Date:
January 19, 2011
Filing Date:
March 01, 2000
Export Citation:
Assignee:
Canon Inc
International Classes:
G06F12/14; H04L9/08; G06F12/00; G06F21/10; G06F21/60; G06F21/62; H04L29/06; H04L9/30
Domestic Patent References:
| JP11203128A | ||||
| JP11346209A | ||||
| JP11239128A | ||||
| JP11261550A | ||||
| JP10187836A |
Attorney, Agent or Firm:
Yasunori Otsuka
Shiro Takayanagi
Shuji Kimura
Yasuhiro Otsuka
Shiro Takayanagi
Shuji Kimura
Yasuhiro Otsuka