DATA MANAGEMENT APPARATUS, POWER USAGE CALCULATION SYSTEM, AND DATA MANAGEMENT METHOD

摘要

According to an embodiment, a data management apparatus includes a first receiver, a generator, a second receiver, a convertor, and a transmitter. The first receiver is configured to receive first values from at least one power meter, the first values being acquired by encrypting power usage amounts collected by the at least one power meter using the corresponding first secret key. The generator is configured to generate a second value by summing the first values. The second receiver is configured to receive a conversion key from a key management server. The conversion key is generated by using the first secret key and the second secret key. The convertor is configured to convert the second value into a third value by using the conversion key. The transmitter is configured to transmit the third value to an application server.

主权项

1. A data management apparatus that is connected to at least one power meter collecting a power usage amount for a unitary time, an application server executing a predetermined application by using a value acquired by summing power usage amounts collected by the at least one power meter, and a key management server maintaining first secret keys maintained by the at least one power meter and a second secret key maintained by the application server, the data management apparatus comprising:
a first receiver configured to receive a plurality of first values from the at least one power meter, each of the first values being the power usage amounts encrypted using the corresponding first secret key; a generator configured to generate a second value by summing the first values; a second receiver configured to receive a conversion key from the key management server, the conversion key being generated by using the first secret key and the second secret key; a converter configured to convert the second value into a third value by using the conversion key; and a transmitter configured to transmit the third value to the application server, wherein the third value is a value from which a value acquired by summing the power usage amounts is acquired by decrypting the third value using the second secret key by the application server.