I've got an application that makes a connection to a database, using a
connection string stored in the application configuration file
(connectionStrings section). I'd like to encrypt only the password in the
string, if possible. Otherwise, I'd like to encrypt the entire string.
However, the value may change while in production, so I need to be able to
change the value and re-encrypt it.

How might I go about doing that? I'd prefer a solution that does not
require Visual Studio tools, as they might not be available; the support team
should be able to make the change and doesn't have Visual Studio.