Hello Duilio,

> can database data be crypted so that even the system administrator
> cannot read it ?

Interbase / Firebird itself has no provision for this. But you can
encrypt sensitive data in your client program and then store it in
the database, e.g. as binary blobs, or even - if you encrypt to a
character set, or give the binary encrypted data a text harness - as
text blobs or (var)chars. For "short" data like passwords, I usually
encrypt to (var)chars.

Greetings,
Paul Vinkenoog