Method and apparatus for performing a secure operation
US6101605A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 1997 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | May 15, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/60
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
To perform a secure operation, an original encrypted value is obtained from a memory. The original encrypted value is decrypted to obtain an original value and an original validity code. The original validity code is compared with a stored validity code. If the original validity code is equivalent to the stored validity code, the secure operation is performed on the original value to produce a new value. Then a permanent alteration is made to the stored validity code to produce a new stored validity code. The new value and the new stored validity code are encrypted to produce a new encrypted value. The new encrypted value is stored in the memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.