Confidentiality Integrity and Authenticity Questions

The CIA triad is a foundational information security model that defines three core security goals. Confidentiality ensures that information is accessible only to authorized parties and is implemented through mechanisms such as encryption at rest and in transit, access control lists, role based access control, data classification, and secure key management. Integrity ensures data has not been altered in an unauthorized manner and is supported by cryptographic hashes, message authentication codes, checksums, versioning, immutability, and integrity checks within protocols. Authenticity verifies the origin or source of data and the identity of communicating parties and is achieved with digital signatures, public key infrastructure and certificates, mutual authentication, and secure authentication protocols. Interview assessment of this topic typically asks candidates to explain each property, map real world controls and cryptographic primitives to the appropriate property, discuss trade offs and failure modes (for example integrity without confidentiality, or authenticity versus anonymity), and describe system level considerations such as key management, replay protection, non repudiation, and how these goals interact in protocols like TLS, code signing, and secure logging.