English: In this example, Alice has a set containing 1, 2, and 3. Bob has a set containing 1, 3, 4, 5, and 9. The intersection is a set containing 1 and 3. The basic PSI security requirement states that Alice must not be able to learn 4, 5, and 9; likewise, Bob must not be able to learn 2.
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Captions
An example illustrating the basic requirement of a PSI protocol.