Encryption system with time-dependent decryption
US6381695B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1998 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Jul 14, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3297
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An object of the invention is to provide an encryption system and method for inhibiting the decryption of encrypted data unless a decryption condition is satisfied. Thus, according to the present invention, in order to provide the encryption system for inhibiting the decryption of encrypted data unless a decryption condition is satisfied, decryption enabled time is designated as a decryption condition, and an encryption system incorporating time-dependent decryption is constituted by a time-key certificate and a time-key certificate manager. A time-key certificate is employed when a third party proves that a public encryption key added to the certificate satisfies the decryption condition. The time-key certificate manager issues a time-key certificate and then manages a decryption key.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.