3.2 Explore the principles of security by design 

Before you start building your fort, you need to know why you're building it, who will use it, and what treasures it will hold. This means understanding everything that will happen in the fort, what you need to protect it from (like dragons or invaders), and how much risk you're okay with (maybe it's okay if it gets a bit messy but not okay if someone steals the treasure).

Think about all the ways someone might try to attack your fort. Could they climb over the walls? Dig a tunnel? Use a giant catapult? Once you know what you're up against, you can design your fort with moats, tall walls, and secret escape routes to protect it.

If you're getting help building your fort from outside knights and architects, make sure they know exactly how secure you want it to be. They need to understand your battle plans and security tricks to make sure everything is super safe.

You should know where every tunnel, trapdoor, and secret passage is in your fort. This means understanding how messages get in and out, where the treasure is stored, and how guards communicate.

Make sure your fort's doors are strong, the walls are high, and any secret messages are written in code. If someone sends a spy pigeon, make sure you can check if the message is really from a friend or if it's a trick.

Don't build a giant fort with lots of empty rooms and open doors. The bigger your fort, the more places there are for invaders to sneak in. Keep it compact, with only the necessary towers and battlements, and make sure every entry point is watched by a guard.

Have backup plans. If the fort is attacked, make sure you have a way to keep fighting or a secret escape route. Have extra supplies and a way to call for reinforcements if you need them.

Set up tripwires and lookout towers to catch anyone trying to sneak into your fort. Keep track of what's normal, so if you see something unusual, like a ladder against the wall or a tunnel being dug, you'll know something's up.

Design your fort so that if one part is taken over, the rest can still be safe. Have firewalls between different sections, and if one treasure room is compromised, make sure the invaders can't get to the rest.