I understand that in end to end encryption the message is encrypted and only the recipient has the key to Decrypt it. How is the key transmitted, and how can the key not get intercepted with the message?
I understand that in end to end encryption the message is encrypted and only the recipient has the key to Decrypt it. How is the key transmitted, and how can the key not get intercepted with the message?
With Diffie-Hellman, wouldn’t the two private keys need to be the same to give the same result?
No. The wiki article explains it better than I can.
https://en.m.wikipedia.org/wiki/Diffie–Hellman_key_exchange
The two private keys represent two channels of information flow. One channel for each direction.
When Alice talked to Bob, they’re using Bob’s keys. When Bob talks to Alice, they’re using Alice’s keys.
If it’s a “two-way” conversation, that’s just two separate one-way channels being combined at the end into what seems like a single, two-way channel.