[generic question] derby and password

[Xavier Vigouroux]

Hi

In my project, I create a database that is access afterwards.
at creation, I would like to "secure" the access.
as a dummy question, what is the usual way to secure an access to the DB
whereas the user is never in the loop. All must be done 
programmatically?

is there a "challenge code"?

I am really a dummy in this area...

thanks