Data management device, power usage calculation system, data management method, and computer program product

摘要

According to an embodiment, a data management device includes a receiver; a first calculator; a second calculator; and a transmitter. The receiver is configured to receive at least one piece of encrypted data obtained by encrypting a piece of data and at least one message authentication code for the piece of encrypted data. The first calculator is configured to aggregate pieces of encrypted data received to calculate aggregated encrypted data corresponding to a sum of the pieces of data encrypted. The second calculator is configured to sum up message authentication codes received to calculate a total value of the message authentication codes for the aggregated encrypted data. The transmitter is configured to transmit the aggregated encrypted data and the total value of the message authentication codes.

主权项

1. A data management device, comprising:
a receiver configured to receive at least one piece of encrypted data obtained by encrypting a piece of data and at least one message authentication code for the piece of encrypted data; a first calculator configured to aggregate pieces of encrypted data received to calculate aggregated encrypted data corresponding to a sum of the pieces of data encrypted; a second calculator configured to sum up message authentication codes received to calculate a total value of the message authentication codes for the aggregated encrypted data; and a transmitter configured to transmit the aggregated encrypted data and the total value of the message authentication codes, wherein the receiver is configured to receive a piece of encrypted data for a measured power usage and a message authentication code for the piece of encrypted data, the first calculator is configured to aggregate pieces of encrypted data received to calculate encrypted data for a total power usage, the second calculator is configured to sum up message authentication codes received to calculate a total value of the message authentication codes for the total power usage, and the transmitter is configured to transmit the encrypted data for the total power usage and the total value of the message authentication codes for the total power usage to a system using the power usage.