| 摘要 |
In order to control a scope of disclosure of information that must be concealed, and information relating thereto, while limiting the possibility of information leakage, a control device according to one mode of embodiment of the present invention is provided with: a means of storing, in a storage domain, first attribute encrypted data obtained by using an attribute-based encryption scheme capable of being decrypted using a second private key to which a specific attribute has been assigned, to encrypt first homomorphic encrypted data that have been encrypted using a homomorphic encryption scheme capable of being decrypted using a first private key; a means for transmitting the first attribute encrypted data, stored in the storage domain, to an analyzing device; a means for receiving from the analyzing device, as a response to said transmission, a computation result obtained by subjecting the first homomorphic encrypted data to a prescribed computation; and a means for storing computed encrypted data, based on the computation result received from the analyzing device, in the storage domain. |
