Authenticated mode control
US8160248B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 2009 |
| Grant date | Apr 17, 2012 |
| Priority date | — |
| Expiry date | Apr 30, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/60
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods and systems for authenticated mode control in controlled devices are disclosed. A method for changing a mode in a controlled device from a current mode includes selecting one of several available key derivation functions based on a target mode, generating a target mode specific root key using a global root key and the selected key derivation function, and the use of that root key to affect a change of the controlled device to a target mode. Corresponding devices and systems are also disclosed. In one embodiment, the methods are applicable to a cable television distribution system and the changing of the operating mode of a set top box from one conditional access provider to another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.