My data, your machine
Consider two different security problems. In the first, you store your valuables in a safe in your basement. The threat is burglars, of course. But the safe is yours, and the house is yours, too. You control access to the safe, and probably have an alarm system.
The second security problem is similar, but you store your valuables in someone else's safe. Even worse, it's someone you don't trust. He doesn't know the combination, but he controls access to the safe.
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