Store an encrypted numeric value and make the unencrypted value visible to just some users in Apex

I'm looking for a way to store an encypted numeric value in one field in a table (so that it appears encrypted even to a DBA) and to display the unencypted value in Apex forms and interactive reports for some users but not others.
Any suggestions as to how I could achieve this?
Thanks in advance.
Martin

Try these documents:
Using Column Masking to Display Sensitive Columns as NULL Values
Using VPD in an APEX Application
Securing Stored Data Using Transparent Data Encryption
The features you request are Database Features.
You could use DBMS_CRYPTO for data encryption instead of TDE, but you will have to create a package for your insert,update, deletes along with a view that allows decryption based on v('APP_USER').
Also, you won't be able to search on that column if you use DBMS_CRYPTO.

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