The recording quality is a bit poor. Regarding the part in the lecture where you compared Server Hello to "Are you a trustworthy user? Authenticate yourself!" - that seems a bit problematic. As far as I know, regular TLS is an authentication process for the server, and the client verifies the certificate provided by the server to confirm whether this server is legitimate. TLS where the server authenticates the client is called mTLS, which performs TLS bidirectionally. However, since issuing and managing certificates for numerous clients is difficult, I understand that mTLS is only used in specific environments. That's why client authentication is performed through something like login after TLS.