?Need help with the code for this in java.. tried to post this question before but answer was not helpful.

& 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 on a secret in response to a randomly generated challenge. Consider based