Method for broadcast encryption and key revocation of stateless receivers
US7039803B2 · kind B2 · utility
37Cited by
14References
78Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2001 |
| Grant date | May 2, 2006 |
| Priority date | — |
| Expiry date | Apr 18, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/606
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A tree is used to partition stateless receivers in a broadcast content encryption system into subsets. Two different methods of partitioning are disclosed. When a set of revoked receivers is identified, the revoked receivers define a relatively small cover of the non-revoked receivers by disjoint subsets. Subset keys associated with the subsets are then used to encrypt a session key that in turn is used to encrypt the broadcast content. Only non-revoked receivers can decrypt the session key and, hence, the content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.