What is cyber security?
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What is cyber security?
- Cyber security is protecting computers, networks, and data from harm and theft.
- As more of our lives move online — money, messages, health records — keeping them safe matters more than ever.
- This course shows you how attacks work and how to defend against them, with hands-on code.
The CIA triad
- Security experts aim for three things, often called the CIA triad:
- Confidentiality — only the right people can read the data.
- Integrity — the data is correct and has not been changed.
- Availability — the data and services are there when you need them.
A short history
- In 1988, the Morris worm spread across the early internet and slowed thousands of machines — one of the first big wake-up calls.
- Since then, security has grown into a huge field, because attackers and defenders are always learning.
Exam-friendly, too
- This course follows the Cambridge IGCSE and A-Level computer-science security topics (and AP CSP).
- Each lesson notes which syllabus points it covers, so it doubles as revision. Let's begin.