Write a Java program, Authenticate, using the following guidelines: Traditional password entry schemes are susceptible to shoulder surfing in which an attacker watches an unsuspecting user enter their password or PIN number and uses it later to gain access to the account. One way to combat this problem is with a randomized challenge-response system. In these systems the user enters different information every time based on a secret in response to a randomly generated challenge. Consider the following scheme in which the password consists of a five-digit PIN number (00000 to 99999). Each digit is assigned a random number that is 1, 2, or 3. The user enters the random numbers that correspond to their PIN instead of their actual PIN numbers.

For example, consider an actual PIN number of 12345. To authenticate the user would be presented with a screen such as: PIN: 0 1 2 3 4 5 6 7 8 9 NUM: 3 2 3 1 1 3 2 2 1 3 The user would enter 23113 instead of 12345.

This does not divulge the password even if an attacker intercepts the entry because 23113 could correspond to other PIN numbers, such as 69440 or 70439. The next time the user logs in, a different sequence of random numbers would be generated, such as: PIN: 0 1 2 3 4 5 6 7 8 9 NUM: 1 1 2 3 1 2 2 3 3 3 The user would enter 12312, instead of 12345.

Note: This is how the program suppose to work: When the user is prompted with, "Enter code:", the user must enter the five (5) digits in the NUM row that are in positions of "PIN" row of the digits of the of the actual password coded in the program.

See the sample below, for the password 99508. The correct entry digits for the password 99508 are: position 9 (in PIN), which is 1 (in NUM), position 9 (in PIN), which is 1 (in NUM), position 5 (in PIN), which is 1 (in NUM), position 0 (in PIN), which is 3 (in NUM), position 8 (in PIN), which is 2 (in NUM) : PIN : 0 1 2 3 4 5 6 7 8 9 NUM: 3 1 2 3 3 1 3 2 2 1 Enter code: 11132 Correct! You may now proceed.

Write a main method to simulate the authentication process.

1. Declare in main method of the class: A. An array of integers, actual_password, to store an actual fixed five digit PIN/Password number.

B. An array of integers, random_nums, to hold randomly generated digits for the digits, from 0 to 9.

C. An array of integers, entered_digits, to hold the digits entered by the user to authenticate.

2. Flow of the main method:

A. Display "PIN : 0 1 2 3 4 5 6 7 8 9", to the screen

B. call a method, genRandomNum(random_nums), to generate random numbers, store, and return the array.

C. call a method, printRandomNum(random_nums), to display "NUM:" and the random digits, to the screen. Make sure these numbers are lined-up with numbers in PIN.

D. call a method, inputUserEntry(entered_digits), to prompt, " Enter code: " and get user's response, and then, display proper message, if or not the users entered response correctly matches the PIN number.