Oracle Error Message
ORA-28394: decryption of data of length string failed
Reason for the Error
Decryption of data failed. Error may be due to plain text data in an external file being submitted for decryption, data encrypted with a different key or a utility being submitted for decryption, or TDE encrypted data in data files being corrupted.
Solution
Verify that the correct external file is being specified or contact Oracle Support Services.