I have a lightning page and the data in that page got mapped to the custom object's corresponding fileds. Now my requirement is the data in that lightning page should not allow duplicates. For that I need to add a key to the code to check if the data is already existing or new one. If already existing then we should not allow that duplicate record in the lightning page. 

I don't really know how to crack this. Please help me with the inputs.

10. Do we need the permission to modify the encrypted fields?

10. Do we need the permission to modify the encrypted fields?

10. Do we need the permission to modify the encrypted fields?