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edXCS50's Introduction to Cybersecurity
85k studentsBEGINNEREnglish
Korshub's take
Cybersecurity as Risk Calculus
Security absolute is a myth. Cybersecurity is always a trade-off: security versus usability, cost versus protection, privacy versus convenience. This course, from the team behind CS50, teaches you to think relationally about threats—not as a binary "hacked or safe" but as a function of risks (what can go wrong) and rewards (what an attacker gains).
You'll learn both high-level conceptual attacks and low-level technical mechanisms, grounded in real incidents. Whether you're protecting your own devices or advising an organization, learn to evaluate which risks matter and which trade-offs make sense.
About this course
This is CS50's introduction to cybersecurity for technical and non-technical audiences alike. Learn how to protect your own data, devices, and systems from today's threats and how to recognize and evaluate tomorrow's as well, both at home and at work. Learn to view cybersecurity not in absolute terms but relative, a function of risks and rewards (for an adversary) and costs and benefits (for you). Learn to recognize cybersecurity as a trade-off with usability itself. Course presents both high-level and low-level examples of threats, providing students with all they need know technically to understand both. Assignments inspired by real-world events.
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