Communication apparatus and communication method and computer readable medium

• US 20060248583A1
• Filed: 03/27/2006
• Published: 11/02/2006
• Est. Priority Date: 04/27/2005
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ishiyama, Masahiro, Inoue, Atsushi
• Granted Patent: US 7,937,748 B2
• Time in Patent Office: Days
• US Class Current: 726/14
• CPC Class Codes: H04L 63/164 at the network layer

Abstract

A communication apparatus includes a storage device to store security associations to be exchanged between an opposite party'"'"'s apparatus, an update device to update the security associations stored in the storage device, before starting a sleep mode for a power-saving operation, and a notification device to notify a message of updating of the security associations by the update device to the opposite party'"'"'s communication apparatus.

Claims

1. A communication apparatus, comprising:

a storage device to store security associations, the security associations being exchanged between an opposite party'"'"'s communication apparatus, and being effective during prescribed lifetimes;

an update device configured to update the security associations stored in the storage device, before starting a sleep mode for a power-saving operation; and

a notification device configured to notify a message that the security associations have been updated by the update device to the opposite party'"'"'s communication apparatus.

2. A communication apparatus according to claim 1, wherein each of the security associations includes a time-limited parameter regarding an IPsec.

3. A communication apparatus, comprising:

a storage device to store security associations, the security association being exchanged between an opposite party'"'"'s communication apparatus, and being effective during prescribed lifetimes;

an adjustment device configured to adjust the lifetimes of each of the security associations stored in the storage device, before starting a sleep mode for a power-saving operation; and

a notification device configured to notify the lifetimes adjusted by the adjustment device to the opposite party'"'"'s communication apparatus.

4. A communication apparatus according to claim 3, wherein

the adjustment device is configured to add scheduled sleep times to the lifetimes of each of the security associations stored in the storage device.

5. A communication apparatus according to claim 3, wherein

the adjustment device is configured to add fixed time periods based on log of previous communications to the lifetimes of the security associations stored in the storage device.

6. A communication apparatus according to claim 3, wherein

each of the security associations includes a time-limited parameter regarding an IPsec.

7. A communication method, comprising:

exchanging security associations between an opposite party'"'"'s communication apparatus;

storing the exchanged security associations in a storage device;

updating the security associations stored in the storage device, before starting a sleep mode for a power-saving operation; and

notifying a message of updating the security associations to the opposite party'"'"'s communication apparatus.

8. A communication method according to claim 7, wherein

each of the security associations includes a time-limited parameter regarding an IPsec communication.

9. A communication method, comprising:

exchanging security associations which are exchanged between an opposite party'"'"'s communication apparatus and have lifetimes;

storing the exchanged secure associations in a storage device;

adjusting the lifetimes of the security associations stored in the storage device, before starting a sleep mode for a power-saving operation; and

notifying the adjusted lifetimes to the opposite party'"'"'s apparatus.

10. A communication method according to claim 9, wherein

the adjusting includes adding of scheduled sleep times to the lifetimes of the security associations stored in the storage device.

11. A communication method according to claim 9, wherein

the adjusting includes adding of fixed time periods based on log of previous communications to the lifetimes of the security associations stored in the storage device.

12. A communication method according to claim 9, wherein

each of the security associations includes a time-limited parameter regarding an IPsec communication.

13. A computer readable medium storing a computer program for causing a computer to execute instructions to perform steps of:

exchanging security associations between an opposite party'"'"'s communication apparatus;

storing the exchanged security associations;

updating the stored security associations, before starting a sleep mode for a power-saving operation; and

notifying a message of updating the security associations to the opposite party'"'"'s communication apparatus.

14. A computer readable medium according to claim 13, wherein

each of the security associations includes a time-limited parameter regarding an IPsec communication.

15. A computer readable medium storing a computer program for causing a computer to execute instructions to perform steps of:

exchanging security associations which are exchanged between an opposite party'"'"'s communication apparatus and have lifetimes;

storing the exchanged secure associations in a storage device;

adjusting the lifetimes of the security associations stored in the storage device, before starting a sleep mode for a power-saving operation; and

notifying the adjusted lifetimes to the opposite party'"'"'s apparatus.

16. A computer readable medium according to claim 15, wherein

each of the security associations includes a time-limited parameter regarding an IPsec communication.