Security controls are measures, safeguards, and countermeasures implemented to protect information systems and organizational assets from threats, reduce risk to acceptable levels, and ensure the confidentiality, integrity, and availability of data. They encompass the complete range of technical, administrative, and physical measures that organizations deploy to defend against cyberattacks, prevent unauthorized access, detect security incidents, and recover from breaches.
Types of Security Controls by Category
Administrative Controls: Policy-based measures governing human behavior, processes, and organizational practices. Include security policies, procedures, standards, security awareness training, employee background checks, access request processes, and incident response plans. Administrative controls establish the governance foundation that technical controls implement.
Technical Controls: Technology-based measures that use software, hardware, and systems to protect information assets. Include firewalls, encryption, intrusion detection systems, multi-factor authentication, endpoint protection platforms, and security information and event management (SIEM) systems.
Physical Controls: Measures that protect information assets through facility security and environmental safeguards. Include access badges, security cameras, locked server rooms, visitor management systems, and environmental monitoring for temperature and humidity in data centers.
Types of Security Controls by Function
Preventive Controls: Designed to stop threats before they can exploit vulnerabilities. Examples include firewalls, multi-factor authentication, encryption, access controls, and security awareness training. Preventive controls represent the first line of defense.
Detective Controls: Designed to identify and alert when a security incident is occurring or has already occurred. Examples include intrusion detection systems, security audits, log monitoring, and behavioral analytics that identify anomalous activity patterns.
Corrective Controls: Activated after a security incident to minimize damage, restore operations, and prevent recurrence. Examples include incident response plans, data recovery processes, system patching, and post-incident security improvements.
Deterrent Controls: Intended to discourage attackers by increasing perceived risk or effort. Examples include warning banners, visible security cameras, and public disclosure of security monitoring capabilities.
Compensating Controls: Alternative measures implemented when primary controls are not feasible. Used to meet security requirements through different means when standard controls cannot be applied.