<div dir="ltr"><div class="gmail_extra"><div>It seems like a private set intersection would be useful here:</div><div><br></div><div><a href="https://eprint.iacr.org/2009/491.pdf">https://eprint.iacr.org/2009/491.pdf</a><br></div><div><br></div>-- <br><div class="gmail_signature">Tony Arcieri<br></div>
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