Flipboard Art & Photo Desk<p>35 years ago, Jim Sanborn presented the cryptographic sculpture Kryptos to the Central Intelligence Agency in Langley, Virginia. Made from copper, granite, quartz and petrified wood, it has four sections, each of which holds a message in code. Over the years, three of the sections have been solved — by CIA code breakers, a California computer scientist, and the National Security Agency. Now, 79-year-old Sanborn says he's going to auction off the solution to the final message, with the company arranging the sale estimating a winning bid between $300,000 and $500,000. Here's <span class="h-card" translate="no"><a href="https://flipboard.com/@newyorktimes" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>newyorktimes</span></a></span>'s story on why he's doing it now, and what he hopes the winning bidder will do with the secret.</p><p><a href="https://flip.it/_TN3II" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">flip.it/_TN3II</span><span class="invisible"></span></a></p><p><a href="https://flipboard.social/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Science</span></a> <a href="https://flipboard.social/tags/Technology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Technology</span></a> <a href="https://flipboard.social/tags/Mathematics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mathematics</span></a> <a href="https://flipboard.social/tags/Codebreaking" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Codebreaking</span></a> <a href="https://flipboard.social/tags/Kryptos" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Kryptos</span></a> <a href="https://flipboard.social/tags/JimSanborn" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>JimSanborn</span></a> <a href="https://flipboard.social/tags/Art" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Art</span></a> <a href="https://flipboard.social/tags/Sculpture" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Sculpture</span></a> <a href="https://flipboard.social/tags/Cryptology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Cryptology</span></a> <a href="https://flipboard.social/tags/Cryptography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Cryptography</span></a> <a href="https://flipboard.social/tags/Cryptanalysis" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Cryptanalysis</span></a></p>