To secure your passport you need a 5-digit PIN-code. Choose your PIN-code  and make sure you use 5 digits. Remember this PIN-code well, there is nobody but you that knows it. 

The app FP provides a triple security:

• you can not create passport unless your have secured your phone with a password
• you can only open the passport with your PIN-code in combinatoin with your username
• even if somebody gets access to the content of your phone, your data is securely encrypted and can not be read without your PIN-code