Suggest an editImprove this articleRefine the answer for “What does the CIA triad mean?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)**CIA triad** is a basic model in information and network security that describes three key properties of information protection: Confidentiality, Integrity, and Availability. **Key point:** the CIA triad describes the basic requirements for a protected system - confidentiality, integrity, and availability of data.Shown above the full answer for quick recall.Answer (EN)Image**CIA triad** is a basic model in information and network security that describes **three key properties of information protection**: **C - Confidentiality** **I - Integrity** **A - Availability** This triad answers the main question: *what should protected information and a system look like?* ## 1. Confidentiality **What it means:** Information must be accessible **only to those who are authorized**. ### Examples for confidentiality: - Only the account owner sees the password - Messenger conversations are inaccessible to outsiders - Company data is not read by attackers ### How it's ensured: - authentication (login + password), - access rights separation, - encryption (HTTPS, VPN). **A breach of confidentiality** is a data leak. --- ## 2. Integrity **What it means:** Data must not be **changed or replaced** without authorization. ### Examples for integrity: - The amount in a bank transfer doesn't change along the way - A file downloads without corruption - System logs are not forged ### How it's ensured: - checksums, - digital signatures, - change control. **A breach of integrity** is data tampering or corruption. --- ## 3. Availability **What it means:** Information and services must be **available when they are needed**. ### Examples for availability: - The website opens without failures - Mail works 24/7 - The server doesn't "crash" under load ### How it's ensured: - backups, - fault tolerance, - DDoS protection. **A breach of availability** is denial of service. --- ## A simple way to remember You can remember it like this: - **Confidentiality** - *who can read it* - **Integrity** - *what wasn't changed* - **Availability** - *always works* --- ## Short answer for the interview Ready-made answer: > *The CIA triad is an information security model that includes confidentiality, integrity, and availability of data. It describes the basic requirements for a protected system.*For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.