SMART METER AND METER READING SYSTEM
First Claim
1. A smart meter having a communication unit to be coupled to a network, a data processor receiving a measurement signal according to a use amount, computing meter read data, and performing communication control by the communication unit, and a secure processor having a tamper resistant performance on internal storage information and performing secure authentication process on a remote access,wherein the secure processor has a first nonvolatile storage device that stores, as information for performing the secure authentication process, a public key unique to the smart meter issued from a predetermined certification authority, a secret key unique to the smart meter, a public key certificate as information obtained by encrypting the public key with a secret key of the certification authority, and a public key of the certification authority,wherein the data processor has a second nonvolatile storage device for storing a public key unique to the smart meter,the data processor encrypts computed meter read data with a public key unique to the smart meter and supplies the encrypted data to the secure processor, andwherein the secure processor decrypts the encrypted meter read data with the secret key unique to the smart meter and stores the decrypted or encrypted meter read data into the first nonvolatile storage device.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention provides a smart meter for use in automatic meter reading of power, gas, and the like, preventing falsification of a program and data and assuring security in a communication path. A smart meter has: a data processor receiving a measurement signal according to a use amount, computing meter read data, and performing communication control by a communication unit coupled to a network; and a secure processor having tamper resistance for internally held information and performing secure authenticating process for a remote access. The data processor encrypts computed meter read data with a public key unique to the smart meter and supplies the encrypted data to the secure processor. The secure processor decrypts the encrypted meter read data with the secret key unique to the smart meter and stores the decrypted or encrypted meter read data into a nonvolatile storage region.
64 Citations
22 Claims
-
1. A smart meter having a communication unit to be coupled to a network, a data processor receiving a measurement signal according to a use amount, computing meter read data, and performing communication control by the communication unit, and a secure processor having a tamper resistant performance on internal storage information and performing secure authentication process on a remote access,
wherein the secure processor has a first nonvolatile storage device that stores, as information for performing the secure authentication process, a public key unique to the smart meter issued from a predetermined certification authority, a secret key unique to the smart meter, a public key certificate as information obtained by encrypting the public key with a secret key of the certification authority, and a public key of the certification authority, wherein the data processor has a second nonvolatile storage device for storing a public key unique to the smart meter, the data processor encrypts computed meter read data with a public key unique to the smart meter and supplies the encrypted data to the secure processor, and wherein the secure processor decrypts the encrypted meter read data with the secret key unique to the smart meter and stores the decrypted or encrypted meter read data into the first nonvolatile storage device.
-
14. A meter reading system having a server and a plurality of smart meters coupled to one another via a network,
wherein the smart meter includes: -
a communication unit coupled to the network; a data processor receiving a measurement signal according to a use amount, computing meter read data, and performing communication control by the communication unit; and a secure processor having tamper resistance for internally stored information and performing secure authentication process on a remote access, wherein the secure processor has a first nonvolatile storage device that stores, as information for performing the secure authentication process, a public key unique to the smart meter issued from a predetermined certification authority, a secret key unique to the smart meter, a public key certificate as information obtained by encrypting the public key with a secret key of the certification authority, and a public key of the certification authority, wherein the data processor has a second nonvolatile storage device for storing a public key unique to the smart meter, wherein the data processor encrypts computed meter read data with a public key unique to the smart meter and supplies the encrypted data to the secure processor, and wherein the secure processor decrypts the encrypted meter read data with the secret key unique to the smart meter and stores the decrypted or encrypted meter read data into the first nonvolatile storage device. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
-
Specification