The -ep option instructs the database server to make a window appear for the user to enter the encryption key for database
started on the command line that require an encryption key. This server option provides an extra measure of security by never
allowing the encryption key to be seen in clear text.
When used with the server, the user is prompted for the encryption key when the following are all true:
the -ep option is specified
the server is a Windows personal server, or the server is just starting up
a key is required to start a database
the database server is either not a Windows service, or it is a Windows service with the interact with desktop option turned
the server isn't a daemon (Unix)
If you want to secure communication packets between client applications and the database server use the -ec server option
and transport-layer security. See Transport-layer security.