Apply Core Security Concepts and Policies

Security rests on three core principles: confidentiality, integrity, and availability—collectively known as the CIA triad. Confidentiality ensures data remains private through access controls like passwords and encryption. Integrity maintains accuracy and consistency of data over its lifecycle, using techniques such as hashing and digital signatures. Availability guarantees reliable access to information for authorized users, often supported by redundancy and disaster recovery plans. These concepts guide all security decisions and policy creation.

Common threats include malware, phishing, ransomware, and unauthorized access. Defenses combine technical and administrative measures. Firewalls filter incoming and outgoing traffic based on rules. Antivirus and anti-malware tools scan for known threats. Access control mechanisms such as passwords, biometrics, and multi-factor authentication verify user identity. Regular updates and patch management reduce vulnerabilities by closing known weaknesses in software.

Security policies translate principles into action. Strong password policies require complexity and rotation. Least privilege restricts users to minimum access needed for their role. Data classification labels sensitivity levels to apply appropriate protections. Incident response plans outline steps when breaches occur, minimizing damage. Aligning technical controls with documented policies creates a resilient security posture across any organization or system.