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How Do Ratchets Protect Your Data?

Imagine if there was a company, and there was a staff common room, and it had a box with the keys to all the rooms in the building. Wouldn’t you worry that someone with some privilege would be able to get into all the rooms in the building, and then you wouldn’t be able to tell who had been in any of the rooms? Won’t you also worry that someone came in, and took a copy of a key, and could still get access to the rooms, and give…