Is it possible to intercept traffic before encryption?

Question

Computer networks

I open Wireshark, and there are all tcp packets
in the form of "gibberish" (maybe they are not encrypted and they should be?). And if they are still encrypted, can I intercept outgoing traffic before it is encrypted with the public key?
Or does it all work differently?

Answer 1

Traffic: first - encrypted, then - sent.
Therefore, there are only 2 options left:
1. catch before encryption
2. replace the public encryption key with your own, so that later it can decrypt encrypted traffic
PS: you can search the Internet for how to do this.

Answer 2

docs.mitmproxy.org/en/stable/howmitmproxy.html