Double Ratchet Messaging Encryption - Computerphile

How does instant messaging encryption protect against attack? Dr Mike Pound on the double ratchet.

This video was filmed and edited by Sean Riley.

[zacksargent]

Dr. Mike Pound is my favorite person that you have ever had on. His explanations are always very clear

[Earthcomputer]

Please do a video on how group conversations are encrypted :)

[kemoknows]

Dr. Pound, thanks to you and your crew for all you do. You bring a lot of clarity to a subject that can be convoluted.

[lion_los]

I'm just writing a comment knowing that YT rates the videos with comments higher than those without, and Mr. Pence deserves every bit of attention he can get. Much love <3

[quicktastic]

At some point, there needs to be an Alice and Bob wedding video. Unless it is done in complete secrecy of course.

[Zhinarkos]

Doctor Mike is my favorite doctor. My father will have to be content with only being the best father in the world. Sorry dad.

[RabieHussien]

Thank you 😊🙏
This by far is the best channel. Alongside Numberphile of course 😜

[matt_b...]

Computerphile, we've entrusted you with the Earth's remaining supply of tractor fed paper for impact printers. Please consider using it more sparingly.

[Rickypick]

I am a simple man. I see Dr Mike Pound in the thumbnail, I click.

[DerAnonymeMax]

I liked your video a lot. It has helped me study for a far too soon exam.
Nevertheless, I find it worth mentioning, how the DH key pairs are changed in a ping-pong effect in the Signal Protocol. When A receives a message from B with a new public key e_B, A changes it's root key once, with the new K_DH=DH(d_A, e_B) key, the it re-initializes the read chain. After that, A creates a new DH key pair and then re-initializes the send chain. So when A sends a message again, it will come with A's new publih DH key and start the same procedure for B.

[WhompingWalrus]

The world needed that animation. Wish I'd have had stuff like that in my university courses.

[kdawg]

Really reminds me of the wheels turning in an Enigma machine.

[daveachuk]

Please do a video on why his hands look so strange when the view of the paper is rotated

[tonyoik]

You said that video packets are encrypted the same way. Since they can arrive out of order (hence the sequence numbers), how are they gonna sync the keys appropriately in order for the message to be decrypted?

[anon-slvp]

Always a pleasure to watch Dr. Mike Pound :)

[dfwz]

Please keep up the messaging protocol content. Great stuff as usual!

[nonchip]

"in practice they [the DH ratchets] are sent every message" but why would one need the other ratchets then, if they get reset on each message? just so Alice goes through more than one key even though Bob never sent her a new DH one because his phone was off/he wasn't replying/etc?

[Mtlstorm]

If the keys are deleted as soon as the message is decrypted, how do you read messages from a long time ago? Are they encrypted on disk using a different mechanism?

[Cygnuslor]

Bloody genius! Can we get one on group messages in Signal?

[jayjones]

Please send my regards to Dr Mike, my dream is to study under this guy