Encryption & Entropy - Computerphile

Information theory shows entropy works a little differently with encryption. Dr Tim Muller takes us through an example


This video was filmed and edited by Sean Riley.

[Inkrementalgeber]

Great video. I'd love to see more about encryption. Maybe even something that's useful without a computer? One time pads and dice can do the trick but you already mentioned the downside of that.

[guytoob]

Learned so much from the hand waving 😄

[Pau]

Love these last information theory videos, would be cool to see something about soft vs hard decoding

[RobinHagg]

I love the way you use magic markers. Please be sponsored and always use it

[nesmaster]

The marker displaying entropy as he writes about entropy lol.

[timng]

speaking of entropy, can u cover physical unclonable functions? something on the hardware side? its pretty intriguing

[cassandraspencer]

In future, may I recommend, when you're filming, to get a pen that works?

[theseed]

I always wondered why the vernam cipher was considered 100% secure

[hoinguyenvinh]

Very clearly. So do you know about the NXP recommend upgrade DESFire EV2 to EV3 card that is the encryption AES128 problem or another issue? I'm thinking about the ev2 encryption is not security enough and they refer to EV3 with higher encry....can share with me what do you thing?

[Yupppi]

I still don't understand how you transfer the initial secret keys without having the encryption keys, and without anyone else grabbing those keys.

[bluegizmo]

0:24 Dude, you gotta stop telling everyone the secret to life, the universe, and everything! 😂

[ttos]

A wrench, any size, using percussive maintenance, will decrypt that using the right rhythm

[engineeringvision]

The weakness in encrytion is not the algorithms, it is that you can compelled to hand the keys over by law.

[arajalali]

His way of explaining things is at par with his marker quality

[charismaticaazim]

What the deal with 42 ? It comes more often than one might expect.

[davidgillies]

It sounds, naively, that prepending a verification block to the ciphertext is a weakness, but given a suitably large key and a sufficiently strong cipher, it's actually not. There are other methods of verification as well. Notably OpenSSL in CBC mode uses the PKCS#7 unpadding to determine correctness (although it's not completely robust) and modern cipher modes like GCM handle message authentication and integrity as part of the process.

[ideallyyours]

This could only mean one thing! But I don't know what that is..

[F_viper_pilot]

What?? That was the most ridiculously confusing word salad I’ve heard in a long time, and I actually write programs dealing with cryptography, CSPRNGs, entropy, symmetrical/asymmetrical algorithms, hashes, etc. and have calculated entropy many times. Wow!!🤪

[punkdigerati]

The 1's in the font in the animation is so weird.

[noir]

20+42 = 2042
I see he’s using Javascript🤣