Encryption system for distributing a common crypt key
US6550009B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1998 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Oct 30, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides an encryption system, by which it is possible to safely distribute a common crypt key for decrypting data on an encrypted DVD-ROM by simple devices and procedure. A terminal equipment 1 comprises a DVD-ROM drive, means for sending a key data request to a center device via communication line, and means for decrypting the encrypted common crypt key using a combination of a part of BCA data and a membership number. A center device 2 comprises means for authenticate a user by searching a user data base 23 in response to the key data request, means for obtaining BCA data of the user by searching a BCA data base 21, means for obtaining a common crypt key by searching a key data base 22, and means for encrypting and transmitting the common crypt key using a combination of a part of BCA data and a membership number. Because a combination of a part of BCA data already distributed and the membership number is used as a key for encrypting the common crypt key, it is possible to safely encrypt and transmit the common crypt key by simple devices and procedure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.