disclaimer: I'm just asking to get understanding of the theory behind network traffic encryption, I know this doesn't happen irl most likely.
Let's take https connection for example. I like watching revolutionary things on youtube and do not wish for authorities to know what I am watching, we accept here for the sake of showcase that google won't sell my watch history if asked (LMAO what am I even saying?).
So if I'm not mistaken since youtube has https implemented, our communication is encrypted, the keys are shared only between me and youtube. But when Youtube shares the key with me/my client the first time, is that also encrypted? Wouldn't the same question keep getting answered until there is something unencrypted? I know this is a bit too much unlikely, but if ISP automated the process of gathering keys and decrypting web traffic for a certain site with them for all users, would that work for them?
I'm taking https here as an example, while I have the same question for like VPN.
EDIT: Thank you everybody. I am not a member of this community, but every comment was a golden experience to read!
Okey, it's like this: You and youtube both generate two keys, public and private. Public keys are public, anyone can see them. Doesn't matter. When you send a message to youtube, you encrypt it with their public key. Now, the trick is, the encryption is asymmetric, which means that the message can only be decoded if you also know the private key, which you never send anyone but keep hidden. Right? This way, as long as your private key is secure, you can not realistically decode the encryption from outside just knowing the public key. Thus setting up a secure connection is just an exchange of public keys.
This is more or less how I understand it.