Oracle encryption wallet 12c
For TDE:

Do transportable tablespaces work with TDE tablespace encryption?


  Yes, but it requires that the wallet containing the master key is
  copied to the secondary database. If the tablespace is moved and the
  master key is not available, the secondary database will return an
  error when the data in the tablespace is accessed.


How to use TTS With TDE (Doc ID 1674166.1)


  ... Only difference when transporting tablespace using TDE is the
  wallet needs to copied to the target database. ...