Method and system for digital information protection
US5701343A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1995 |
| Grant date | Dec 23, 1997 |
| Priority date | — |
| Expiry date | Nov 29, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2221/2101
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digital information protection scheme using an improved security protocol. In a system in which a user makes an access to a digital information provided by an information center by connecting a computer card owned by the user to an information terminal device connected with the information center, a work key for encrypting a desired digital information is delivered from the information center to the computer card through the information terminal device, and the work key is registered in the computer card; the desired digital information encrypted by the work key is delivered from the information center to the information terminal device; and an encrypted digital information delivered from the information center is decrypted at the information terminal device by using the work key registered in the computer card, and a decrypted digital information is provided to the user at the information terminal device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.