key
The encryption key is a string, including mixed cases, numbers, letters, and special characters. Database keys cannot
include leading spaces, trailing spaces, or semicolons.
You must specify this parameter when you start an encrypted database with a connect request. You do not need to specify this
parameter if you are connecting to an encrypted database that is already running.
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.