A Personal Identification Number (PIN) is a widely used numeric password. The 4-digit pin numeric password is being used as authentication in many important applications such as, an ATM. An ATM is a place where the shoulder surfing attack is of great concern. There are some existing methods that provide security to the pin entry. But, those methods use only limited cognitive capabilities of the human adversary. The major disadvantage that exists here is that human adversaries can be more effective at eavesdropping and assumptions by training themselves.