Password/ Encryption in Base 5?

How can secure a database in Base (LibreOffice Version: with a password?
The usual way with “secure as” does not work, because the checkbox “save with password” is missing (in Base).
Is there another way? Is there any extension for encrypting database-ODF-documents?

I believe the front-end ODF container cannot be secured. There are however multiple (external to LO) options for securing the data. Refer these forum threads: