Alice and bob are on two sides of a river. the only way to send a message from one side to the other is to send it via eve, who operates a ferry. alice and bob use public key crypto and have their public keys displayed in billboards beside the riverbank which can be seen from the other side. suppose that alice wants to start communicating securely with bob. however, alice and bob are worried that malicious eve can eavesdrop on their communications and change it.

design an efficient scheme that would allow alice and bob to communicate confidentially communicate, such that

(a) eve cannot read the messages
(b) eve cannot replay messages, and
(c) eve cannot modify messages.

Write a car class having two private member variables called tank and speed. write public methods called pumpgas and gofast. the method pumpgas gets an integer for gas that must be pumped. that value needs to be added to tank (no more than 20 gallons). it must return the amount of gas that is purchased ($4 per gallon). the method gofast should increase the speed by 5 each time it is called.write a constructor for the above class that initialized both variables to zero.write a tostring to display both the tank and speed when the car is printed.modify the car class to implement the interface comparable and an interface called carinter having the public methods in carinter.write the main program to create an array of size 5 of type car. create 5 car objects having each location of the array to refer to one of the cars. test the pumpgas, gofast, equals method on the array items. write an enhanced loop to print all the car values (using a tostring written last time).write a generic method to find the minimum of four items. pass int, double, char, string and car objects to test this method.

What is the digital revolution and how did it change society? what are the benefits of digital media?

What engine component is shown in the above figure?