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An attacker examines a hotel's publicly available guest registration database. He can see that room 1408 is not listed as booked nor as available. In fact, it is not listed at all. From this information, an attacker makes the conclusion that room 1408 is used for VIP customers who want to keep their stay secret. What type of attack is described here?
Inference attack
Data diddling
Social engineering
Side-channel attack
Inference attack uses trivial information to obtain more important information without directly accessing the database. EDIT: I like the 1408 movie reference.
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