Method for recovering from encryption key variable loss
US5241597A · kind A · utility
30Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 1, 1991 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Feb 1, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0894
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for recovering from encryption key variable loss, either inadvertent or the result of tampering. A predetermined key encryption key is encrypted with itself at the time when keys are first loaded, and the resultant key loss key is stored in non-volatile memory. This key loss key acts as a key encryption key for decryption of new shadow and traffic keys.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.