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[MUSIC PLAYING]

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DAVID MALAN: Hello, world.

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My name is David Malan, and
this is CS50 Introduction

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to Cybersecurity for technical
and nontechnical audiences alike.

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In this course, you'll learn how to
secure your accounts, data, systems,

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and software against
today's threats and how

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to recognize and evaluate tomorrow's
as well, both at home and at work.

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You'll learn how to
preserve your own privacy.

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You'll learn how to view
cybersecurity not in absolute terms,

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but relative, a function of risks
and rewards for an adversary

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and costs and benefits for you.

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And you'll learn to
recognize cybersecurity

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as a trade off with usability itself.

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In the world of cybersecurity, I
daresay you and I have to be perfect.

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All of our doors, all of our windows,
virtually speaking, have to be locked.

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But an adversary has to find
just one mistake that we've

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made-- a single door or window ajar.

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So perhaps we should be focused not
only on prevention, but on detection

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especially, through
auditing, through monitoring,

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so that even if an adversary gets in,
we can at least detect as much quickly

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and minimize the downsides for us
and, in turn, the upsides for them.

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Perhaps nowadays, tools like
artificial intelligence or AI

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can even help with that, detecting
patterns and potential adversaries'

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behavior that we might
not even notice ourselves.

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And perhaps, if we raise the bar
high enough for the adversary,

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increasing their cost, their risk,
decreasing their potential reward,

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they'll simply lose
interest in us as a target.

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Of course, if they have
more resources than us,

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they might very well win anyway.

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But will they be even interested in us?

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Which of these threats should
we actually worry about?

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Throughout this course, we'll present
both high-level and low-level examples

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of threats and provide you with all you
need technically to understand both,

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even if you're not a programmer
or computer person yourself.

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Through those examples, we'll introduce
you to certain first principles,

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how computers themselves work, so
that you can understand and deduce,

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even after the course ends, how other
threats that the world might not

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have even seen yet actually work.

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This is CS50's Introduction
to Cybersecurity.

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