What is required for the implementation of TEMPEST countermeasures?

The requirement for the implementation of TEMPEST countermeasures is that they must be recommended by a Certified TEMPEST Technical Authority (CTTA) and authorized by a government official. This process is crucial because TEMPEST refers to the study and control of compromising emissions from electronic equipment, aimed at preventing unauthorized access or interception of information. The involvement of a CTTA ensures that the measures taken are technically sound, and government authorization underscores the importance of oversight and compliance with national security regulations. This framework is designed to guarantee the efficacy and appropriateness of the countermeasures being implemented in order to protect sensitive information.