<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Shamir sharing scheme to split the key in two. Send your half to the other one to let them decrypt it. <div><br></div><div>David<br><br><div id="AppleMailSignature" dir="ltr">Sent from my iPhone</div><div dir="ltr"><br>On Mar 28, 2019, at 3:36 PM, Ben Laurie <<a href="mailto:ben@links.org">ben@links.org</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Who encrypted this file?</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 28 Mar 2019 at 13:48, B Da Bahia <<a href="mailto:bidabahia@gmail.com">bidabahia@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hello list,</div><div>I'm looking for a cryptographic algorithm to solve the following problem:</div><div>Alice and Bob (untrusting partners) want to cooperate to open an encrypted file located at either one's computer. No party should be able to open it without the other party's consent. No trusted third parties are allowed to intervene in the protocol.</div><div>Could anyone provide useful references to explore?</div><div>thanks in advance!</div><div><br></div></div> _______________________________________________<br> Messaging mailing list<br> <a href="mailto:Messaging@moderncrypto.org" target="_blank">Messaging@moderncrypto.org</a><br> <a href="https://moderncrypto.org/mailman/listinfo/messaging" rel="noreferrer" target="_blank">https://moderncrypto.org/mailman/listinfo/messaging</a><br> </blockquote></div> </div></blockquote><blockquote type="cite"><div dir="ltr"><span>_______________________________________________</span><br><span>Messaging mailing list</span><br><span><a href="mailto:Messaging@moderncrypto.org">Messaging@moderncrypto.org</a></span><br><span><a href="https://moderncrypto.org/mailman/listinfo/messaging">https://moderncrypto.org/mailman/listinfo/messaging</a></span><br></div></blockquote></div></body></html>