Consider a simple authentication protocol below.

A simple authentication protocol

$(1)C$ AS: III$|\frac{|}{P}$I $||III$

$(2)$ AS $$ C: TTTTTT

$(3)CV$:$,II||TTTTTT$

$TTTTTT=E(KI,[II|\frac{|}{P}$I $||III])$

where $C=$ client, $AS=$ authentication server, $V=$ server, IDC$=$ identifier of user on $C,$

IDV$=$ identifier of $V,PC=$ password of user on $C,KV=$ secret encryption key shared by $AS$

and $V$

i$.$ What are the two main problems in this simple protocol?

ii$.$ Suggest possible improvements to the protocol to address the problems.