Consider a building in which all doors have been equipped with an electronic lock consisting of a keypad and screen. The locks are controlled through a central management server where user authentication data is maintained. Each user must enter a 4-digit user ID first, then when prompted for password, enter a 4-digit password to open the door lock. Any attempt for forced entry should raise an alarm at the central management server. Design a communication protocol between the lock and the central server. Provide a list of messages (with their respective fields and parameters) in your protocol. Also, for each of the following use cases, sketch a diagram that shows the sequence of messages Successful authentication Authentication error Forced entry alarm