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Difficulty: MediumHardware and Embedded Systems Security

An electrical utility provider is deploying smart grid field concentrator units to unmonitored outdoor locations. The units will transmit sensitive metering telemetry and must be protected against physical tampering, unauthorized firmware manipulation, and key extraction. Which of the following hardware security controls should the security architect require for these embedded devices? (Select TWO).

  1. Implementation of a hardware Root of Trust combined with a Trusted Platform Module (TPM) to perform measured boot and secure cryptographic keys.Answer
  2. Integration of physical tamper detection sensors connected to active zeroization circuits to purge sensitive key material if the chassis is compromised.Answer
  3. C
    Storage of master symmetric encryption keys in unencrypted onboard flash memory to optimize key retrieval speed during transmission.
  4. D
    Configuration of host-based stateful packet inspection firewalls in software to prevent physical side-channel voltage probing attacks.

Answer

The device security architecture must incorporate a hardware Root of Trust with a TPM for measured boot integrity, along with physical tamper detection sensors linked to zeroization circuits to clear cryptographic key material upon physical intrusion.
Establishing a hardware Root of Trust with a TPM guarantees firmware integrity through measured boot and protects cryptographic keys within dedicated secure hardware. Combining this with physical tamper detection and zeroization ensures that physical intrusion results in the immediate destruction of sensitive key material, effectively mitigating both software manipulation and physical extraction risks.

Step-by-Step Solution

1
Analyze deployment environment and threat vectors.
Identified risks including physical access, unauthorized firmware modification, and physical cryptographic key extraction on unmonitored field hardware.
Unmanned outdoor embedded infrastructure requires hardware-anchored security controls.
2
Evaluate controls for boot integrity and key isolation.
Hardware Root of Trust and TPM validate bootloader components sequentially and isolate cryptographic processes from software-layer exploits.
A TPM and hardware Root of Trust form the foundational trust anchor for verifying system integrity before executing system code.
3
Evaluate controls for physical enclosure breach.
Physical tamper detection switches linked to zeroization logic instantly wipe cryptographic keys if the outer casing is breached.
Zeroization ensures keys cannot be recovered via hardware bus probing or physical extraction once physical boundary defenses fail.

Key Concept

Hardware Root of Trust, TPM measured boot, and physical tamper zeroization mechanisms in embedded hardware security.
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Topics

Hardware and Embedded Systems Security

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