He shook his head to acknowledge her letting him know and kept on walking almost bumping right into Sheena, the hot twenty something blonde that worke... in customer service. Not that Ray would have minded running into her she was tall, thin, pretty and had a big pair of firm tits that she went out of her way to showcase. Her nipples always popped out like little thumbs on her big rack, and today was no exception, her nipples were stuck out hard and erect through the thin bra and sweater she was. "Let's add a little watermark to your data. Before you give Eve your results, let's just perturb all of the statistics for the answers, very slightly, with some random numbers. 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.. More

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