The system security officer must grant you permission for working with encryption keys.
Encrypting columns
In the server, click Databases to display a list of available databases.
Select the database to open and expand it.
Select the User Tables folder to display a list of the tables in the database.
Select the table you want.
Select Columns to display the table columns.
Right-click the column and select Properties.
Click the Encryption tab.
Select Encrypt.
Select a key in the With Key field or use the default shown.
Click Apply to set the change.