Episode 12: Confidentiality, Integrity, and Availability (CIA Triad) (Domain 1)

The CIA Triad—Confidentiality, Integrity, and Availability—forms the foundational model upon which nearly all cybersecurity principles and practices are built. In this episode, we explore each pillar of the triad in detail, beginning with confidentiality, which ensures that sensitive data is accessible only to authorized individuals through controls like encryption, access management, and classification. Integrity focuses on maintaining the accuracy and trustworthiness of data through techniques like hashing, checksums, and secure change control, while availability ensures that systems and data are accessible when needed by implementing redundancy, failover systems, and denial-of-service protections. We provide real-world examples of how these three elements can be in tension—such as a highly confidential system that limits availability—and how organizations must prioritize them based on mission requirements. Understanding how to balance and enforce the CIA Triad is essential for Security+ candidates, as it underpins every major decision in cybersecurity architecture and policy.