Data Encryption for CRM Online

I have an application that needs the additional of several customer fields.

I need to encrypt several of these fields (medical records).

I am somewhat confused / uncertain after reading several articles on CRM data encryption.

• I know that SQL Server supports TDE.
• I know that data encryption is enabled with CRM Online.
• I understand that CRM automatically encrypts certain sensitive data types mainly to do with server side synchronisation

What I cannot find out is: - 

1. Does CRM Online 2016 support encryption of custom fields? and
2. How doe I enable data encryption for custom fields?

Can you help me?

Joe

Joe