Information processing apparatus and communication device

Patent metadata

Field	Value
Publication number	US-9985754-B2
Application number	US-201514833662-A
Country	US
Kind code	B2
Filing date	Aug 24, 2015
Priority date	Aug 25, 2014
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

An information processing apparatus comprises a first circuitry and a second circuitry. The first circuitry first/second demand response requests from first/second communication devices. The second circuitry creates first request content information representing contents of the first demand response request, sends it to a time-stamping authority, and acquires first time certification information containing a time stamp that the time-stamping authority issues for the first demand response request. The second circuitry stores the first time certification information in a storage device to be associates with the first demand response request; and determine, when the second demand response request is received, whether the second demand response request is retransmission of the first demand response request. When it is the retransmission, the second circuitry causes the first circuitry to send the second demand response request and the first time certification information associated with it in the storage device, to a second communication device.

First claim

The invention claimed is:

1. An information processing apparatus comprising:
first circuitry configured to receive a first demand response request from a first communication device; and
second circuitry configured to:
create first request content information representing contents of the first demand response request, from the first demand response request;
send the first request content information to a time-stamping authority, and acquire first time certification information that the time-stamping authority sends in response to this sending, the first time certification information including a time stamp that the time-stamping authority issues for the first demand response request; and
associate the first time certification information with the first demand response request and store the first time certification information in a storage device;
wherein the first circuitry is configured to transmit the received first demand response request and the first time certification information to a second communication device,
wherein the second circuitry is configured to, when the first circuitry receives a second demand response request from the first communication device after the first circuitry receives the first demand response request, determine whether the second demand response request is retransmission of the first demand response request; and
wherein the first circuitry is configured to, when the second circuitry determines that the second demand response request is the retransmission of the first demand response request, send the second demand response request and the first time certification information associated with the first demand response request in the storage device, to the second communication device.

2. The information processing apparatus according to claim 1 , wherein
the second circuitry is configured to create second request content information representing contents of the second demand response request, from the second demand response request,
the second circuitry is configured to send the second request content information to the time-stamping authority, and acquire second time certification information that the time-stamping authority sends in response to this sending, the second time certification information including a time stamp that the time-stamping authority issues for the second demand response request, and
the second circuitry is configured to, based on determining that the second demand response request is not the retransmission of the first demand response request, cause the first circuitry to send the second time certification information acquired by the second circuitry and the second demand response request, to the second communication device.

3. The information processing apparatus according to claim 1 , wherein the first time certification information includes, in addition to the time stamp that the time-stamping authority issues for the first demand response request, a value corresponding to the first request content information.

4. The information processing apparatus according to claim 3 , wherein the first time certification information includes information into which the time-stamping authority encrypts information including the value corresponding to the first request content information and the time stamp that the time-stamping authority issues for the first demand response request.

5. The information processing apparatus according to claim 2 , wherein the second time certification information includes, in addition to the time stamp that the time-stamping authority issues for the second demand response request, a value corresponding to the second request content information.

6. The information processing apparatus according to claim 5 , wherein the second time certification information includes information into which the time-stamping authority encrypts information including the value corresponding to the second request content information and the time stamp that the time-stamping authority issues for the second demand response request.

7. The information processing apparatus according to claim 4 , wherein the encryption by the time-stamping authority includes encryption using a private key in a public-key cryptosystem.

8. The information processing apparatus according to claim 1 , wherein
the second circuitry is configured to, when the first demand response request is received by the first circuitry, associate the first request content information with the first time certification information, and control storing the first request content information and the first time certification information in the storage device,
wherein the second circuitry is configured to, when the second demand response request is received by the first circuitry, create second request content information to identify the second demand response request from the second demand response request,
wherein the second circuitry is configured to determine whether the second demand response request is the retransmission of the first demand response request by determining whether request content information identical to the second request content information is stored in the storage device, and
the second circuitry is configured to, based on determining that the request content information identical to the second request content information is stored in the storage device, read the first time certification information corresponding to the request content information identical to the second request content information from the storage device, and cause the first circuitry to send the read first time certification information to the second communication device.

9. The information processing apparatus according to claim 1 , wherein
the second circuitry is configured to, when the first demand response request is received by the first circuitry, send the first request content information and the first time certification information to the first communication device such that the first communication device associates the first request content information with the first time certification information and cause the storage device to store the first request content information and the first time certification information,
the second circuitry is configured to determine whether the second demand response request is the retransmission of the first demand response request by determining whether the first time certification information is added to the second demand response request received by the first circuitry, and
the second circuitry is configured to, based on the first time certification information being added to the second demand response request, cause the first circuitry to send the added first time certification information to the second communication device.

10. The information processing apparatus according to claim 9 , wherein
the second circuitry is configured to, when the second demand response request is received by the first circuitry, extract second request content information to identify the second demand response request from the second demand response request, and
the second circuitry is further configured to verify whether the first time certification information is correct using the added first time certification information and the second request content information.

11. The information processing apparatus according to claim 10 , wherein the second circuitry is configured to decrypt the added first time certification information using a public key distributed from the time-stamping authority, and verify whether the first time certification information is correct by comparing a decrypted value with the second request content information.

12. The

Assignees

• Toshiba Kk

Inventors

• Kaneko Yu
• Maegawa Tomonori
• Mera Keisuke
• Ito Masashi

Classifications

• H04L2463/121

  Timestamp · CPC title

• H04L63/062

  for key distribution, e.g. centrally by trusted party (cryptographic mechanisms or cryptographic arrangements for key distribution involving a central third party H04L9/0819) · CPC title

• H04L63/123

  received data contents, e.g. message integrity · CPC title

• H04L63/0281 Primary

  Proxies · CPC title

• H04L63/0442

  wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption (cryptographic mechanisms or cryptographic arrangements for public-key encryption H04L9/30) · CPC title