Those random numbers form a kind of watermark."If someone cheats by making up a set of answers using your measurements, they'll pass your test, but we...can still use a correlation test to detect the watermark. If you have a lot of questions, say, a hundred or so, you don't need much of a watermark to see if they cheated. Using a correlation test to detect random numbers is amazingly sensitive."Cassie thought the idea sounded completely impractical.Who would go to the trouble of making up a bunch. You fuckin’ bitch. How dare you think you can use me like that.” She threw the sheet back over my face and slammed the door. I tried to come to grips with what had just happened. I struggled mightily, thinking maybe I could break the bed frame, but it was no use. I had no idea how much time had passed, but I heard her come back in and screamed at her to help me. Suddenly she pulled the sheet off my face. Her eyes were red and puffy, as if she had been crying, and her lower lip was trembling. “I. More

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