Certificate-based encryption and public key infrastructure
US7657748B2 · kind B2 · utility
16Cited by
19References
100Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 28, 2003 |
| Grant date | Feb 2, 2010 |
| Priority date | — |
| Expiry date | Jan 12, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3265
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital message is sent from a sender to a recipient in a public-key based cryptosystem comprising an authorizer. The authorizer can be a single entity or comprise a hierarchical or distributed entity. In some embodiments, no key status queries or key escrow are needed. The recipient can decrypt the message only if the recipient possesses up-to-date authority from the authorizer. Other features are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.