Data communications
US6996722B1 · kind B1 · utility
51Cited by
14References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1998 |
| Grant date | Feb 7, 2006 |
| Priority date | — |
| Expiry date | Dec 15, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/60
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a data communications system a remote data source outputs data as a series of application data units (ADUs). Each ADU is individually encrypted with a different key. The keys are transmitted (for example using Internet multicasting) via a communications network to one or more customer terminals. At the terminals a sequence of keys is generated for use in decrypting the ADUs. A record is kept of the keys generated, and this record may subsequently be used to generate a receipt for the data received by the customer. The keys may be generated, and the record stored within a secure module such as a smartcard.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.