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Difficulty: EasyHardware and Embedded Systems Security

A security engineer is establishing hardware hardening controls for smart grid embedded devices deployed in physically accessible remote locations. Which of the following hardware-level controls will protect device integrity and prevent unauthorized boot-level tampering? (Select TWO.)

  1. Implementation of Secure Boot backed by a hardware Root of Trust to verify bootloader cryptographic signaturesAnswer
  2. Deployment of eFuse technology to permanently lock bootloader settings and disable sensitive hardware debug interfacesAnswer
  3. C
    Applying network firewall filtering rules on upstream routers to block low-level software buffer overflow exploits
  4. D
    Configuring asymmetric RSA algorithms for continuous, high-speed bulk encryption of sensor memory telemetry

Answer

The correct controls are implementing Secure Boot backed by a hardware Root of Trust and deploying eFuse technology to permanently lock bootloader settings and debug interfaces.
Establishing a hardware Root of Trust for Secure Boot ensures that the system checks cryptographic signatures before running any firmware or boot code. Complementing this with eFuse technology provides a permanent, hardware-enforced lockdown of configuration parameters and debugging interfaces that cannot be reverted through software.

Step-by-Step Solution

1
Analyze the hardware security requirement for embedded systems deployed in unmonitored environments.
Identified the primary requirement: preventing unauthorized firmware modification and enforcing low-level integrity.
Physical accessibility makes remote embedded devices vulnerable to unauthorized bootloader flashing and hardware-level tampering.
2
Select appropriate hardware-rooted integrity mechanisms.
Secure Boot with a Root of Trust verifies firmware signatures at initialization, while eFuses permanently enforce immutable configuration state.
Both mechanisms provide low-level, hardware-backed integrity guarantees against unauthorized code execution.

Key Concept

Hardware-rooted security mechanisms, such as Secure Boot with a Root of Trust and eFuse lockdown, protect device integrity by ensuring only authenticated firmware executes.
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Topics

Hardware and Embedded Systems Security

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