Re-authentication apparatus and method in downloadable conditional access system
US8539236B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2010 |
| Grant date | Sep 17, 2013 |
| Priority date | — |
| Expiry date | Jan 21, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/76
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided is a re-authentication apparatus in a Downloadable Conditional Access System (DCAS), the re-authentication apparatus includes: a receiving unit to receive a key request message from a Secure Micro (SM); a determination unit to determine whether to perform re-authentication depending on downloading of SM client image; an identification unit to identify an SM identifier using the key request message, when the re-authentication is performed as a result of the determination; an extraction unit to retrieve previous session information corresponding to the SM identifier and to extract keying information about the previous session information; and an encryption unit to control an encryption key about the SM client image to be reused, the SM client image being encrypted in a previous session based on the previous session information using the keying information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.