Controlling access to an area
US7822989B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2004 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | May 6, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/20
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Controlling access includes providing a barrier to access that includes a controller that selectively allows access, at least one administration entity generating credentials/proofs, wherein no valid proofs are determinable given only the credentials and values for expired proofs, the controller receiving the credentials/proofs, the controller determining if access is presently authorized, and, if access is presently authorized, the controller allowing access. The credentials/proofs may be in one part or may be in separate parts. There may be a first administration entity that generates the credentials and other administration entities that generate proofs. The first administration entity may also generate proofs or the first administration entity may not generate proofs. The credentials may correspond to a digital certificate that includes a final value that is a result of applying a one way function to a first one of the proofs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.