Knowing md5(c+x), is it possible to find md5(x)? - MathOverflow most recent 30 from http://mathoverflow.net 2013-05-23T05:48:35Z http://mathoverflow.net/feeds/question/107447 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/107447/knowing-md5cx-is-it-possible-to-find-md5x Knowing md5(c+x), is it possible to find md5(x)? Max Selivanov 2012-09-18T08:42:57Z 2012-09-18T08:42:57Z <p>Suppose:</p> <p>md5(c1 + x) = c2</p> <p>md5(x) = y</p> <p>Is it possible to find <strong>y</strong>, if <strong>c1</strong> and <strong>c2</strong> are known and <strong>x</strong> is uknown? Basically, I know <em>md5(salt + key)</em> and I want to find <em>md5(key)</em>.</p>