Encrypting/Hiding messages in PI using "Sensitive Data" Option in Service Interface

Hi Every one,

We are going to implement interfaces in SAP PI 7.31 dual stack based on below tasks

Q1: How to Encrypting/hiding Messages in PI using "Sensitive Data" option in Service interface.

Q2: How to Hide Payloads by Customizing roles in ABAP and JAVA stacks?

Q3: How can we hide/mask only few fields in a payload?

Please let me know the solutions for above questions .

Thanks in Advance

Regards,

Narender