A defense contractor operates a secure on-premises data center that processes controlled classified information. To meet TEMPEST guidelines, the security engineer must prevent Wi-Fi, Bluetooth, cellular, and other radio signals from entering or leaving the server room while still permitting authorized staff to walk in and out. Which physical access control best fulfills this requirement?
Replace interior windows with reflective privacy glass.
Deploy a mantrap with dual interlocking doors and badge readers at the server-room entrance.
Install a Faraday cage that lines the server-room walls, ceiling, and floor with conductive mesh.
Add perimeter bollards to prevent vehicle collisions with the facility.
A Faraday cage (also called RF shielding) surrounds a room with a continuous conductive barrier-usually copper or aluminum mesh or foil-that attenuates radio-frequency energy entering or leaving the space. This blocks wireless eavesdropping and electromagnetic interference, satisfying TEMPEST or similar emission-security mandates. A mantrap controls who can enter but does not block RF signals. Reflective glass can obscure visual inspection and slightly reduce RF, yet it is not designed for full signal suppression. Bollards stop vehicle ramming attacks and have no effect on electromagnetic emanations.
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