Method and system for synchronizing multiple secure clocks using an average adjusted time of the secure clocks if the average adjusted time is within the limit intersection and using a substitute average adjusted time if the averaged adjusted time is outside the limit intersection
US8533515B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2010 |
| Grant date | Sep 10, 2013 |
| Priority date | — |
| Expiry date | Nov 10, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G7/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for synchronizing secure clocks in a system without using any external clock, a system configured to perform the method, and a computer medium storing system code. Each secure clock is adjustable subject to a set of predetermined adjustment constraints. The intersection of the adjustment constraints of all the clocks is a limit intersection. The clocks may be synchronized to an average adjusted time of the secure clocks (if the average adjusted time is within the limit intersection) or to a substitute average adjusted time within the limit intersection if the average adjusted time is outside the limit intersection. Synchronization can occur in response to a request to adjust at least one of the clocks by a proposed clock adjustment value or to synchronize at least one of them without otherwise adjusting them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.