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<p>can be used to prove that data (even if confidential) existed at a certain time.  <a href="page.php?w=Secure_multiparty_computation">Secure multiparty computation</a> can be used to compute answers (such as determining the highest bid in an auction) based on confidential data (such as private bids), so that when the protocol is complete the participants know only their own input and the answer. <a href="page.php?w=End-to-end_auditable_voting_systems">End-to-end auditable voting systems</a> provide sets of desirable privacy and auditability properties</p><p>
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