AES Explained (Advanced Encryption Standard) - Computerphile

Advanced Encryption Standard - Dr Mike Pound explains this ubiquitous encryption technique.

n.b in the matrix multiplication animation, the matrices are in the incorrect order, but hopefully the animation still helps to illustrate the general idea.

This video was filmed and edited by Sean Riley.

[Damian-lusx]

Computerphile and Numberphile are a blessing. I remember my math classes in college and we were taught different things about math but we were never told what they were used for. Now after seeing these videos I literally feel like I'd actually even enjoy learning maths. It makes sense because now I know why something is useful and when it may come in handy...

[golicar]

Before I watched this video I had no idea how AES worked. Now I've watched it and still have no idea how it works.

[Felix-vehs]

I knew what AES is for over 8 years but today I learned how it works

[rot]

There is an issue with the animation at 11:02. Matrix multiplication is not commutative, the matrix has to be multiplied from the left ( the shown multiplication is not even doable)

[kvelez]

0:36
Encryption

2:34
XOR

2:55
Process.

3:20
Rounds of encryption.

7:40
Byte replacement.

8:33
Row shifting.

13:00
AES errors and CPU.

[supdawg]

Just a correction: the vector operand at 10:59 should be on the other side of the matrix. Matrix multiplication is undefined in the way you have it written because the sizes of the vector and the matrix don’t match.

[Grimlock]

1:46 Drawing a 4 by 4 grid 101:
1. Draw a square (roughly)
2. Draw a vertical line through the middle.
3. Draw 2 more vertical lines through the middle of each half.
4. Draw a horizontal line through the middle.
5. Draw 2 more horizontal lines through the middle of each half.

[dotaprorussian]

I love his explanations but these videos give me the feeling that camera-man just randomly bursts in to Mikes office and asks him random questions.

[vernekarraghavendranagaraj]

Absolutely love the way Mr. Pound teaches. Can listen for hours together. Waiting for many more such interesting videos.

[rastkomiocinovic]

Thank you for making these videos. I have been watching them for years, finding the algorithms fascinating and the explanations very easy. As a second year cs student I must say that watching this channel realy helps me now more than ever. Keep up the awesome work!

[DeshantaDevkota]

Hey computerphile, thanks to all of the team for sharing the enthusiasm of Computer Science with me and other students, it's easy to find the lectures boring so I come here often to get more insights and intuitions. Being here enables me to learn things casually.

[timshearer]

I just want to say this is a great description of Galois fields in practical use. I learned it from textbooks way back when, and it was mind boggling.

[KumManish]

He taught the nitty gritty, your way of teaching and breaking things up to chunks is just wow. Thankyou Man, you just won my heart. Watching this is 2024 makes sense 😄🚀

[ColibriX]

I just talked a few hours ago with a colleague about how we could use this encription on an arduino to secure the data sent to a raspberry for a project (never used it before). And now you upload this... I need to use a mic detector in my classroom. Thanks for the explanation!

[dandan]

itd be insane if he actually encrypted a message going to all of those steps
not much was talked about the generation and usage of the key

[Zerbey]

You're an excellent teacher, you took something very complicated and made it easy even for someone like myself who only has A level education in maths.

[rayanslimani]

a lecture of 1.5 hours didn't understand it, just watched this video understood it in 14 min, TY you saved my semester .

[dropcake]

I literally just learned this yesterday in my cryptography class. Great refresher Dr. Pound!

[fantazzmagazz]

Dude! you're just a legend and so clear in your explanations! What I couldn't stop noticing is the scene you're filmed in. You sitting next to a white board is absolutely identical to watching The Office!

[zombiegun]

This man is one of the most interesting people I have ever had the pleasure of listening to. Kudos!