[dagw]

Security by obscurity isn't a bad practice, it just shouldn't be your main practice. Absolutely design your system with the assumption that the attacker has complete access to all information about your setup, but it's still reasonable to try to obscure as many of those details as possible. Your setup will have flaws and you will make mistakes, so you want to try to minimize the damage those mistakes might cause and increase the time/effort needed to exploit them.