System and method for protecting data files by periodically refreshing a decryption key
US6937726B1 · kind B1 · utility
45Cited by
143References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1999 |
| Grant date | Aug 30, 2005 |
| Priority date | — |
| Expiry date | Dec 21, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/76
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods for transferring among key holders in encoding and cryptographic systems the right to decode and decrypt messages in a way that does not explicitly reveal decoding and decrypting keys used and the original messages. Such methods are more secure and more efficient than typical re-encoding and re-encryption schemes, and are useful in developing such applications as document distribution and long-term file protection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.