What is this thing on my door?

14 comments
  1. You can leave your apartment key in there if your landlord needs to do repairs. They’ll have a key that opens a small opening in the door. 🙂

  2. You can pull it off and behind there’s a chain you can hang a key from. It has a lock on the outside that can be unlocked. So if you need to let someone in to do some work you can just hang a key there to give them access.

  3. As a few have said, it’s a space for you to put a service key for when (if) your landlord needs to do repairs or send some maintenance crew over, like painters or ventilation control.

    They get access to the your key from the outside with a special key they borrow from the landlord so ther you don’t have to be at home for them to fix your apartment

  4. That thing is for you to learn how encryption works,

    You need to get a washing machine to the landlord for him to repair while you are not home.
    You first use your key to lock the door (AES encryption). Anyone with your key can unlock it, so you need to transfer the key safely to your landlord. This is done by putting it into that small thing on the door (RSA encryption). From this side you can just open and put the key in there, it is the landlord’s RSA public key. But from the other side, noone can access except the landlord, because he has the RSA private key. He can then get your key to open the door.

    And why do we bother with two types of locks, both AES and RSA? It is because RSA cannot fit a washing machine, only the small key.

  5. Edit: Thank you all for the upvotes and down votes on the comments!! Now I know that it’s a maintenance key holder thingy, I’m kind of new to this living in an apartment on my own thing so thank you guys so much for all the help!! d(>_< )

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