What is the focus of TEMPEST investigations?

The focus of TEMPEST investigations is on investigating compromising emanations. TEMPEST refers to a set of standards and practices aimed at protecting sensitive information from electromagnetic emissions that can be intercepted by unauthorized individuals. These emanations can include signals emitted by electronic devices, which can inadvertently leak confidential data. Conducting TEMPEST investigations involves analyzing these emissions to ensure that they do not provide exploitable data to potential adversaries. This ensures the security and integrity of classified and sensitive information within an organization.

The other options may touch on related security topics, but they do not specifically align with the core purpose of TEMPEST, which is primarily concerned with the protection against electromagnetic threats.