Final answer:
TEMPEST countermeasure reviews are conducted or validated by specialized government agencies or contractors to ensure compliance with security standards. While small groups can exert influence, the effectiveness of such influence depends on various factors. Threat assessment involves meticulous testing and evaluation of security measures.
Step-by-step explanation:
The responsibility to conduct or validate all TEMPEST countermeasure reviews in accordance with the specified references typically falls on government agencies or approved contractors who specialize in TEMPEST certification and testing. These reviews are crucial to ensure that electronic equipment complies with the necessary security standards to prevent compromising emanations which could potentially lead to unauthorized access to sensitive information. These agencies or contractors work in line with national security directives to assess the threat levels and effectiveness of TEMPEST countermeasures.
Concerning influence, just because a small group of people can exert influence does not inherently mean that they will always choose to do so. When they do exert influence, its effectiveness can vary based on several factors including the context, methods used, and the susceptibility of the target audience to the influence.
To fully assess the threat, rigorous testing and evaluation processes are employed by the conducting agency. They review technical specifications, physical security measures, and the intended operating environment. This comprehensive assessment ensures that all potential risks are identified and mitigated against in line with the highest security protocols.