Which term describes the practice of preventing emission of signals from equipment processing classified information?

Which term describes the practice of preventing emission of signals from equipment processing classified information?

• A. Emissions Security (Emsec)
• B. Information Security (INFOsec)
• C. Operations Security (OPSEC)
• D. Cybersecurity

Answer: (A)

Emissions security is the practice that focuses on preventing signals from leaking out of equipment processing classified information. It addresses unintentional radiations—through radio, magnetic, acoustic, or even optical emissions—that could be intercepted by an observer. To protect against this, people use shielding, proper enclosures, carefully routed and filtered cables, equipment with low emission characteristics, and secure facilities or TEMPEST-type testing and controls. This is distinct from broader information security, which covers protecting information in all forms (not just emissions); operations security, which centers on safeguarding plans and procedures from being inferred; and cybersecurity, which deals with protecting networks and digital systems. Emissions security is the specific focus on preventing those unintended signal leaks.

Emissions security is the practice that focuses on preventing signals from leaking out of equipment processing classified information. It addresses unintentional radiations—through radio, magnetic, acoustic, or even optical emissions—that could be intercepted by an observer. To protect against this, people use shielding, proper enclosures, carefully routed and filtered cables, equipment with low emission characteristics, and secure facilities or TEMPEST-type testing and controls. This is distinct from broader information security, which covers protecting information in all forms (not just emissions); operations security, which centers on safeguarding plans and procedures from being inferred; and cybersecurity, which deals with protecting networks and digital systems. Emissions security is the specific focus on preventing those unintended signal leaks.