What type of shielding is used to protect very sensitive equipment from electromagnetic radiation?

Tempest shielding is specifically designed to protect sensitive equipment from electromagnetic radiation that could be intercepted and analyzed by unauthorized parties. The term "TEMPEST" refers to a U.S. government program aimed at securing electronic communications and preventing emissions that could disclose classified information. This type of shielding effectively mitigates the risk of eavesdropping or data theft by containing the electromagnetic emissions within a controlled environment.

In the context of sensitive equipment, such as computers, communication devices, or any electronic systems where confidentiality is critical, applying TEMPEST shielding helps maintain the integrity of the information being processed or transmitted.

Understanding the other options may provide clarity on why they do not serve the same purpose. Current carrier devices pertain more to the conduction of electricity, pneumatic cavity shielding involves mechanical systems for noise control, and pen register shielding is associated with telecommunications and the recording of phone numbers dialed. None of these options directly address the specific need to shield against electromagnetic interference in order to protect sensitive information from potential compromise.