Method, information service system and program for information encryption/decryption
US9479330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2014 |
| Grant date | Oct 25, 2016 |
| Priority date | — |
| Expiry date | Dec 20, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0861
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
With a portal server, a request for information from a terminal of a second user that is an agent for a first user is received, and an encrypted data directed to a terminal of the first user, stored in an encrypted-data memory unit, is re-encrypted using a re-encryption key for the second user, stored in a first encryption-key memory unit, and is transmitted to the terminal of the second user, with the terminal of the second user, the re-encrypted data received is decrypted using an encryption key for the second user, stored in a second encryption-key memory unit, and time keys specified by the terminal of the first user, related to a time-period during which browsing of the information is permitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.