Abstract: An electronic device comprises a secured module arranged to store secured data. A component outside the secured module has a normal operating mode with a normal mode operating voltage. An interface is arranged to provide access to the secured module. A voltage monitoring unit is connected to the component and arranged to monitor an operating voltage Vsup of the component. An interface control unit is connected to the voltage monitoring unit and the interface. The interface control unit is arranged to inhibit access to the secured module through the interface when the operating voltage is below a predetermined secure access voltage level, the secure access voltage being higher than the normal mode operating voltage.

Abstract: An electronic device comprises a secured module arranged to store secured data. A component outside the secured module has a normal operating mode with a normal mode operating voltage. An interface is arranged to provide access to the secured module. A voltage monitoring unit is connected to the component and arranged to monitor an operating voltage Vsup of the component. An interface control unit is connected to the voltage monitoring unit and the interface. The interface control unit is arranged to inhibit access to the secured module through the interface when the operating voltage is below a predetermined secure access voltage level, the secure access voltage being higher than the normal mode operating voltage.

Abstract: Embodiments of the present invention provide systems and methods to enable secure communication between a host processor and external real time counter (RTC) logic. In an embodiment, the host processor generates a message including a command to an external device containing the RTC. The external device verifies a Message Authentication Code (MAC) included in the message and responds to the command. Embodiments of the present invention advantageously provide a dedicated power domain for the external RTC logic while guarding against third party attacks on the RTC logic and the communication between the RTC logic and the host processor.