<div dir="ltr"><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jun 28, 2017 at 12:09 PM, Ron Garret <span dir="ltr"><<a href="mailto:ron@flownet.com" target="_blank">ron@flownet.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
On Jun 28, 2017, at 9:00 AM, Ron Garret <<a href="mailto:ron@flownet.com">ron@flownet.com</a>> wrote:<br>
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> <a href="https://github.com/laie/WorldsFirstSha2Vulnerability" rel="noreferrer" target="_blank">https://github.com/laie/<wbr>WorldsFirstSha2Vulnerability</a><br>
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Turns out to be a false alarm.<br>
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<a href="https://crypto.stackexchange.com/questions/48580/fixed-point-of-the-sha-256-compression-function" rel="noreferrer" target="_blank">https://crypto.stackexchange.<wbr>com/questions/48580/fixed-<wbr>point-of-the-sha-256-<wbr>compression-function</a><br>
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Oh well, learn something new every day.<br></blockquote><div><br></div><div class="gmail_default" style="font-size:small">​I am confused. Since when did SHA-256 have an ​initialization vector?</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">If IV input to the MD construction and the output are the same for any block input, construction of an arbitrary number of collisions is trivial since H (X) = H (X+X) = H (X+X ... X)</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">What is being shown here?</div></div></div></div>