Terminal device, group management server, network communication system, and method for generating encryption key
US7978858B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2008 |
| Grant date | Jul 12, 2011 |
| Priority date | — |
| Expiry date | May 12, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0894
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A network communication system has terminal devices belonging to a group, the terminal devices generating, if there is a leaving terminal device leaving from the group, an updated group encryption key corresponding to a new group encryption key, from a deletion key corresponding to the leaving terminal device and a group encryption key, and, after the leaving terminal device leaves the group, communicating by using the updated group encryption key; and a group management server generating the updated group encryption key corresponding to the new group encryption key from the deletion key corresponding to the leaving terminal device and the group encryption key, and, after the leaving terminal device leaves the group, communicating by using the updated group encryption key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.