<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Apr 7, 2024, at 11:55 PM, Michael Kjörling <<a href="mailto:9bf3a7ef93bb@ewoof.net" class="">9bf3a7ef93bb@ewoof.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">On 6 Apr 2024 09:12 -0700, from <a href="mailto:ron@flownet.com" class="">ron@flownet.com</a> (Ron Garret):<br class=""><blockquote type="cite" class="">Because they don't have a sha256 hash of<br class="">deb360ae3c1ff7a29f83731b33dcd4bf354a5e80de2dc50370ebf55a14216b85.<br class="">At best they produce that value after a limited number of rounds (i<br class="">didn't actually check) but that is not the challenge.<br class=""></blockquote><br class="">That is also not consistent with a reasonable interpretation of one<br class="">claim that was made by McDair, who specifically stated that "when<br class="">expanded to the full 64 rounds, the method finds 'a' valid input<br class="">message". (See McDair's post dated 7 Jan 2024 12:06 UTC, message-ID<br class=""><<a href="mailto:O8Ulq67s866xgJJK6QUAU7y2eWHuDq8ySZ2x3wF-IUKW4SuyH3Nv9IocvszpX5Av2x6zy5ulnk8u01cI27ZktiNjaiF0bL5Aeq0UL3flbEU=@protonmail.com" class="">O8Ulq67s866xgJJK6QUAU7y2eWHuDq8ySZ2x3wF-IUKW4SuyH3Nv9IocvszpX5Av2x6zy5ulnk8u01cI27ZktiNjaiF0bL5Aeq0UL3flbEU=@protonmail.com</a>><br class="">archived at <<a href="https://www.metzdowd.com/pipermail/cryptography/2024-January/038287.html" class="">https://www.metzdowd.com/pipermail/cryptography/2024-January/038287.html</a>>.)<br class=""></div></div></blockquote><div><br class=""></div><div>Yeah, I was trying to be charitable.</div><br class=""><blockquote type="cite" class=""><div class=""><div class=""><blockquote type="cite" class="">(BTW, it is easily seen that McDair's examples are almost certainly<br class="">not fulfillments of Ray's challenge simpy because he gives more than<br class="">one example. If all of those examples were in fact fulfillments of<br class="">Ray's challenge then not only would he have found a sha256 preimage,<br class="">he would have found a *collision*, and that would be Big News.)<br class=""></blockquote><br class="">Editorial comment: the challenge was issued by me; not by Ray<br class="">Dillinger as McDair indicated in the post dated 28 March 2024 10:42 UTC,<br class="">message-ID <<a href="mailto:CC2D-QBePuVd2YiNOC9TgkVgCWSkBEBDR1D1mfd48GoLMFP48j7S2py5fmL7txf9pYcBMXknZDuhXQrD-KD-4r7klXr0sU--IWP9ThHvjY4=@protonmail.com" class="">CC2D-QBePuVd2YiNOC9TgkVgCWSkBEBDR1D1mfd48GoLMFP48j7S2py5fmL7txf9pYcBMXknZDuhXQrD-KD-4r7klXr0sU--IWP9ThHvjY4=@protonmail.com</a>>,<br class="">archived at <<a href="https://www.metzdowd.com/pipermail/cryptography/2024-March/038315.html" class="">https://www.metzdowd.com/pipermail/cryptography/2024-March/038315.html</a>>.<br class=""><br class="">The challenge was issued in my post dated 8 Jan 2024 15:03 UTC,<br class="">message-ID <<a href="mailto:2d6288d9-106b-4b91-8289-5309c9c06d95@home.arpa" class="">2d6288d9-106b-4b91-8289-5309c9c06d95@home.arpa</a>>, archived at<br class=""><<a href="https://www.metzdowd.com/pipermail/cryptography/2024-January/038288.html" class="">https://www.metzdowd.com/pipermail/cryptography/2024-January/038288.html</a>>.<br class=""></div></div></blockquote></div><br class=""><div class="">My apologies for the misattribution. I was going off of McDair's attribution:</div><div class=""><br class=""></div><div class=""><blockquote type="cite" class=""><span style="font-family: Arial, sans-serif; font-size: 14px;" class="">The challenge as presented by Mr. Dillinger is as follows:</span></blockquote></div><div class=""><br class=""></div><div class="">But I guess I should have realized that trusting anything McDair says is probably a mistake.</div><div class=""><br class=""></div><div class="">On which note...</div><div class=""><br class=""></div><div class=""><blockquote type="cite" class=""><div class="">On Apr 8, 2024, at 7:17 AM, McDair via cryptography <<a href="mailto:cryptography@metzdowd.com" class="">cryptography@metzdowd.com</a>> wrote:</div><div class=""><div class="protonmail_quote" style="font-family: Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);"><br class=""></div><div class="protonmail_quote" style="font-family: Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);">Are you sure I'm a 'he'?</div></div></blockquote></div><div class=""><br class=""></div><div class="">I am now.</div><div class=""><br class=""></div><div class="">rg</div><div class=""><br class=""></div></body></html>