Password plays vital role in the authentication process by providing information and computer security. We use common authentication method such as Personal Identification Number(PIN) in various devices ATM’s, mobile devices and electronic door locks. This PIN entry method is not safe. When user enters their PIN in popular place, attacker observes the PIN over their shoulder. This is called shoulder surfing attack (SSA).In this project we will propose a method to prevent this SSA attack. Whenever we need to enter PIN code, we will be using our mobile phone to type that pin code.