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dangina [55]
3 years ago
5

Problem 1 (Authentication): Consider the following authentication protocol, which uses a classical cryptosystem. Alice generates

a random message r, enciphers it with the key k she shares with Bob, and sends the enciphered message {r}k to Bob. Bob deciphers it, adds 1 to r, and sends {r + 1}k back to Alice. Alice deciphers the message and compares it with r. If the difference is 1, she knows that her correspondent shares the same key k and is therefore Bob. If not, she assumes that her correspondent does not share the key k and so is not Bob. Does this protocol authenticate Bob to Alice? If so, Why? Otherwise, explain why not.
Computers and Technology
1 answer:
Elis [28]3 years ago
5 0

Answer:

Check the explanation

Explanation:

Yes, going by the question above, the protocol validates Bob to Alice for the reason that the key is only shared between Bob and Alice as well as the number which is being sent randomly. Therefore the invader won’t be able to predict and response to that number. Because of the authentication protocol, that makes use of a classical cryptosystem thereby resulting into the possibility of an argument such that key finding is attainable via invader.

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The 'client area' of a window is the area used to display the contents of the window (thus a title bar or border would lie outsi
Lady_Fox [76]

Answer:

<u>Window.java</u>

  1. public class Window {
  2.    int width;
  3.    int height;
  4.    public Window(int width, int height){
  5.        this.width = width;
  6.        this.height = height;
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  8.    public int getWidth(){
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  11.    public int getHeight(){
  12.        return height;
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<u>Main.java</u>

  1. public class Main {
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Explanation:

<u>Window.java</u>

There is a Window class with two int type attributes, width and height (Line 1 - 3).

The constructor of this class will take two inputs, width and height and set these input to its attributes (Line 5 - 8). There are two methods getWidth and getHeight which will return the value of attributes width and height, respectively (Line 10 - 16).

The required new method getClientAreaHeight is defined in line 18 -20. This method will call the getHeight method to return the height value of the window (Line 19).

<u>Main.java</u>

We test the Window class by creating one Window instance and call the getClientAreaHeight method and print the return output (Line 1 -6).

We shall see 15 is printed.

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