Assume that a private internet requires that the messages at the

application layer be encrypted and decrypted for security

purposes. If we need to add some information about the

encryption$/$decryption process $($such as the algorithms used in

the process$),$ does it mean that we are adding one layer to the

TCP$/$IP protocol suite? Redraw the TCP$/$IP layers $($Figure

$1\mathrm{.}17$b$)$ if you think so$.$