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=== Private set intersection ===
[[Private set intersection]] is a cryptographic technique that enables two or more parties to compare their private sets to determine which entries they share in common, but without disclosing any
For example, private set intersection could be used by two users of a social network to determine which friends they have in common, without revealing the identities of friends they do not have in common. To do this, they could share the outputs of an OPRF applied to the friend's identity (e.g., the friend's phone number or e-mail address).
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