How do keys open locks?

A computer security expert explains how keys work – and how they are like passwords.

The locks and keys.One big open lock and two smaller lock are among many different keys on the white background Stock Photo - Alamy

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How To Open a Lock Without a Key!

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Do different types of keys open different types of locks?, by James Henry

How come some locks have multiple keys but only open one door, while others have just one key that opens many doors (like the ones at work)? - Quora

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5 Ways to Lock a Door - wikiHow

247] How Does A Lock Work