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CGP Grey

Encryption

CGP Grey

CGP Grey

Education

4.9797 Ratings

🗓️ 14 April 2016

⏱️ 5 minutes

🧾️ Download transcript

Summary

Transcript

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0:00.0

Hello internet. We need to talk about locks, the physical and the digital.

0:04.0

In the physical world, locks aren't as good as you think they are.

0:07.0

The lock on your door stops worries not burglars, as two minutes of searching will reveal.

0:13.0

Spend more get more, but all fail with tools and time enough.

0:17.0

That physical locks are bad at locking mostly doesn't matter in normal life because burglars are constrained by the physical world.

0:23.6

A burglar must cruise the neighborhood spending their time to pick a target which makes a house that looks secure most of the way toward being secure.

0:30.6

Each target house can then only be attacked one at a time and comes with a risk of being physically caught in the act. But digital is different.

0:39.3

The constraints of the physical no longer apply.

0:42.3

On the internet, a digital lock must protect you from not just the neighborhood burglar, but all burglars everywhere.

0:48.3

For, on the internet, there's no such thing as distance.

0:52.3

Internet burglars don't crack digital locks personally.

0:54.6

They build burglar bots that try millions of combinations just to see what opens.

0:59.8

One lock down the street or a country full on the other side of the world, it's all the

1:04.3

same.

1:05.3

Actually, other side of the world is better.

1:07.0

A dude in East Whateverlandia stealing your identity has a near zero chance of getting caught.

1:12.6

This is bad news, but thanks to mathematics, digital locks can be made unbreakable.

1:17.6

This is encryption, a digital lock that without the password cannot be opened.

1:22.6

Burglar bots will plow through all the possibilities, but a secure password will take longer than the

1:27.6

heat death of the universe to guess.

1:29.8

No password, no entry, no matter how much of elite hacker your mom is.

1:34.0

Your private files stay private.

...

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