| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a key management system capable of safely managing keys not in a severely managed environment. <P>SOLUTION: A master key management device includes a re-encryption key generation means of using a first secret key and a third secret key stored in a first storage means to generate a re-encryption key used to re-encrypt a second secret key encrypted with a first open key stored in a second storage means into a second secret key encrypted with a third open key using. A key management server device includes a reception means of receiving the re-encryption key generated by the re-encryption key generation means from the master key management device in a state in which the master key management device and the key management server device are connected; and a third storage means of storing the re-encryption key received by the reception means. The connection between the master key management device and the key management server device is broken after the re-encryption key is stored in the third storage means. <P>COPYRIGHT: (C)2012,JPO&INPIT |
