Encryption and HTTPS in Plain Words
beginner 40 min 3 tasks
How encryption keeps secrets secret, the two kinds of keys, and what the padlock and certificate warnings in your browser are really telling you.
By the end of this lesson you can tell hashing from encryption, describe symmetric and public-key encryption, explain which key must stay private, and explain what a certificate is and what to do when your browser warns about one. This lesson has no lab and no commands: it explains in plain words the ideas behind the padlock in your browser, and every answer is in the text.
Part of these paths
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Updated 2026-11-01