Once TDE is created, it is very important component of the database and never delete or move out of the wallet location. If the old wallet is lost, then the database has to be recreated and the encrypted data is lost.
Typical solution is to restore the old wallet in location.
select * from v$encryption_wallet;
Oracle recommends that the wallet files are placed outside of the $ORACLE_BASE directory to avoid having them backed up to the same location as other Oracle files. In addition, it is recommended to restrict the access to the directory and to the wallet files to avoid accidental removals.
See Metalink Doc ID 1228046.1 master note for TDE
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