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Difficulty: Very hardPhysical Security Controls

An incident response technician has confiscated a powered mobile device suspected of containing unencrypted corporate data relevant to an ongoing investigation. To preserve forensic integrity, the technician must prevent the device from receiving remote signals—such as a remote wipe or locking command via cellular networks, Wi-Fi, or Bluetooth—while transporting it to the digital forensics laboratory. Which physical security control is most effective for this scenario?

  1. Enclosing the device in a Faraday bagAnswer
  2. B
    Attaching a Kensington cable lock to the chassis
  3. C
    Applying a polarized privacy filter over the display screen
  4. D
    Securing the device inside a biometric lockbox without shielding

Answer

Enclosing the device in a Faraday bag is the most effective physical control to prevent wireless signals from reaching the device during transit.
Enclosing the device in a Faraday bag blocks electromagnetic signals (radio frequency shielding), preventing cellular, Wi-Fi, and Bluetooth signals from connecting to the device and triggering a remote wipe or lock command.

Step-by-Step Solution

1
Identify the primary threat in the scenario
The main risk is remote command transmission (such as a remote wipe) via cellular, Wi-Fi, or Bluetooth signals.
Incident response requires preserving evidence in its state at seizure without allowing network connectivity to modify or erase data.
2
Evaluate physical security controls designed to block radio frequency (RF) signals
A Faraday bag/enclosure blocks external electromagnetic fields and radio frequencies.
By absorbing or reflecting incoming and outgoing signals, the device remains powered without connecting to any external network.
3
Differentiate Faraday shielding from standard physical anti-theft or access controls
Controls like cable locks, privacy screens, or unshielded lockboxes address physical theft or shoulder surfing, not RF communication.
Only RF shielding prevents remote data alteration during transport.

Key Concept

RF Shielding / Faraday Enclosures for Physical Security
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Topics

Physical Security Controls

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