Detection of frequency modulation of a secure time base
US11043102B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2019 |
| Grant date | Jun 22, 2021 |
| Priority date | — |
| Expiry date | May 19, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/004
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An electronic system can include a charge storage device controllably connected to a voltage source; a protected circuit block controllably connected to the charge storage device for receiving a voltage supply from the charge storage device, the protected circuit block operating via an operating clock signal; a voltage detector coupled to the voltage supply of the protected circuit block; a comparator coupled to an output of the voltage detector; and a countermeasure processor coupled to receive an alert signal from an output of the comparator. The voltage at the voltage supply is related to the frequency of the operating clock and a frequency manipulation attack is detected by monitoring a difference between the voltage supply and a comparison voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.