Management service device, backup service device, communication terminal device, and storage medium
A technology of storage medium and communication terminal, which is applied in the fields of computer security device, collaborative operation device, electronic digital data processing, etc.
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Embodiment 2
[0101] In Embodiment 2 described below, the data stored in the storage medium is received via the Internet, stored in the backup service device as backup data, and when the storage medium is lost, the backup data is sent to another storage medium for backup. Example of reduction.
[0102] FIG. 9 is a diagram showing the configuration of a key management system according to the second embodiment.
[0103] The structure of the key management system of Embodiment 2 is based on the structure of the key management system of Embodiment 1, and further includes: a backup service device 710 that receives data stored in the storage medium 110 via the Internet 140 and stores them as backup data. .
[0104] The backup service device 710 has: a communication part 711 for communicating via the Internet 140; a backup part 712 for storing data stored in the storage medium 110 sent from the communication terminal device 120; a control part 713 for controlling them; The authentication unit 71...
Embodiment 3
[0121] In Embodiment 2 above, when the storage medium is authenticated using the PKI method, the public key stored in the storage medium and its certificate are sent to the backup service device. On the other hand, in Embodiment 3 described below, an embodiment will be described in which the backup service device has stored the public key from the beginning, and as a result, verification of the validity of the certificate of the public key is not required.
[0122] Fig. 13 is a diagram showing the configuration of a key management system according to the third embodiment.
[0123] The structure of the key management system of the third embodiment is the same as that of the key management system of the second embodiment. In fact, the management service device 130 also exists, but it is not shown here.
[0124] The structure of the backup service device 710 in Embodiment 3 is based on the structure of the backup service device 710 in Embodiment 2, and further includes: a switch...
Embodiment 4
[0133]In the above-mentioned Embodiment 2 and Embodiment 3, the data stored in the storage medium is backed up to the backup service device in plain text. In Embodiment 4 described below, as shown in FIG. 17 , it is described that the public key stored in the secondary storage medium β is written into the primary storage medium α, and the data stored in the storage medium is encrypted using it. It is backed up to the backup service device via the network, and then the backup data is decoded and restored to other storage media.
[0134] The structure of the key management system of Embodiment 4 is the same as that of the key management system of Embodiment 2 or Embodiment 3.
[0135] As shown in FIG. 18 , in addition to the configuration of the second embodiment, the communication terminal device 120 further includes an encryption key for encrypting data to be backed up using the public key of the second storage medium stored in the first storage medium. Component 1281; a decr...
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