The Needham-Schroeder protocol is:
Here Na and Nb are nonces.
Kab is the key between a and b
Kas is the key between A and KDC
Kbs is the key between B and KDC
My Question: In step 2 if we don't encrypt with Kbs & in step 3 we encrypt
using Kab instead of Kbs what will happen? Following are the changes: