java, that's how i reseved it ( UPDATE )

Traditional password entry schemes are susceptible to shoulder surfing in which

an attacker watches an unsuspecting user enter his or her 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 gener-

ated 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 it, the user

would be presented with a screen such as the following:

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 the following:

PIN: 0 1 2 3 4 5 6 7 8 9

NUM: 1 1 2 3 1 2 2 3 3 3

Your program should simulate the authentication process. Store an actual PIN

number in your program. The program should use an array to assign random

numbers to the digits from 0 to 9. Output the random digits to the screen, input

the response from the user, and output whether or not the users response correctly

matches the PIN number.