Locks and keys to protect your valuable stuff! When you craft a key and lock (they are 2 separate items) you get a plain key and plain lock. When you right click while holding a key or lock, you will be taken to a gui where you get to pick out the shape of the key and lock. The key shape you chose has to match the lock shape you chose otherwise it won't work. This causes a redstone signal to be generated from the lock for a short amount of time to activate whatever traps or alarms you have set up.
Lock:
Key:
I do believe this could become popular on servers and make very interesting and easier to make adventure maps. Locks and keys can also be used on chests and etc. Comment on what you think.
Lock:
Key:
I do believe this could become popular on servers and make very interesting and easier to make adventure maps. Locks and keys can also be used on chests and etc. Comment on what you think.
http://www.minecraftforum.net/topic/1560573-keys-locks-should-use-anvils-to-set-passwords/
In my idea, rather than make a new GUI it would use the anvil item renaming mechanic to set key passwords.