Public key cryptography: What is it? | Computer Science | Khan Academy

Why do we need public key cryptography?
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Computer Science on Khan Academy: Learn select topics from computer science - algorithms (how we solve common problems in computer science and measure the efficiency of our solutions), cryptography (how we protect secret information), and information theory (how we encode and compress information).
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[@dhayes5143]

This paint analogy is much much better than any involving secret messages or simplified versions of the maths involved. After many videos on the topic, I finally understand it! Thank you.

[@spock7945]

such non technical or non jargon laden educational videos can be a good starting point to go on and hook students/people up!

[@78anurag]

Who's thought of this must have been genius

[@alvinkatojr]

Brilliant explanation!

[@UhOohSpaghettiOs]

So... encryption algorithms which only use 1 key (private key) are known as Symmetric Encryption methods right?
and encryption algorithms which use a private key and a public key like the example above are Asymmetric encryption methods? Is this correct? and is the Symmetric encryption method (1 key) still in use today?

[@AlekseyVitebskiy]

Yes, the symmetric encryption methods are still used today. Public key cryptography is only used for key exchange. The reason for this is that public key cryptography tends to be slow, while private key cryptography is fast(er). For example in SSL, the initial handshake is usually done with RSA (public key encryption) and actual communication is done with AES. Essentially the only thing that's encrypted by RSA is the AES private key, the actual message is encrypted using AES.

[@nacs]

0:17 -- Apparently Bush narrated this video -- "Nu-key-ler"

[@melp7614]

This! So very much this!!

[@AnirudhTammireddy]

cant unhear this now, can I?

[@tennma6250]

Thank you for korean subtitle

[@ahfbemdlcnr]

I think it is not an explanation of public key cryptography, but Diffie-Hellman key exchange.

[@rupert2002]

Early works of Christian Bale 2:13

[@melp7614]

Just 19secs in & this video is invalidated by the fact you seemingly don't know that new-cue-lar is not a word. President GW Bush saying a thousand times while in office doesn't change that. It's pronounced new-clee-er. 🤦‍♀️