Key update method and apparatus thereof
US8081754B2 · kind B2 · utility
3Cited by
2References
7Claims
0Family size
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Key dates
| Filing date | May 18, 2007 |
| Grant date | Dec 20, 2011 |
| Priority date | — |
| Expiry date | Oct 27, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W12/041
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A key update method and a key update apparatus are provided. The method includes storing data in a database of an update server, the data having an encoded updated node key in response to a node key update for a group; selecting necessary data, from among the data having the encoded updated node key, to calculate a key immediately prior to when the member is switched to the online mode, and generating member update data; and performing a key update with respect to the member using the member update data in a device corresponding to the member which has switched from the offline mode to the online mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.