KAIST-IS521
diff --git a/‎ctf/2017/index.html
+46 b/‎ctf/2017/index.html
+46
diff --git a/‎index.html
+1 b/‎index.html
+1
diff --git a/‎js/jquery.countdown.min.js
+22 b/‎js/jquery.countdown.min.js
+22
diff --git a/‎js/jquery.min.js
+4 b/‎js/jquery.min.js
+4
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="description" content="KAIST IS-521 course">
+    <meta name="author" content="Sang Kil Cha">
+    <link rel="shortcut icon" type='image/x-icon' href="/favicon.ico" />
+
+    <title>KAIST IS-521</title>
+
+    <link href="../../css/bootstrap.min.css" rel="stylesheet">
+    <link href="../../css/is521.css" rel="stylesheet">
+  </head>
+
+  <body>
+
+    <!-- Begin page content -->
+    <div class="container">
+      <div class="page-header">
+        <h1>IS-521 CTF</h1>
+      </div>
+      <h4>Begins in:</h4>
+      <div id="myclock"></div>
+    </div>
+
+    <footer class="footer">
+      <div class="container">
+        <p class="text-muted">IS-521: Information Security Laboratory @ KAIST</p>
+      </div>
+    </footer>
+
+    <script src="../../js/jquery.min.js"></script>
+    <script src="../../js/jquery.countdown.min.js"></script>
+    <script>
+    $("#myclock")
+    .countdown("2017/05/31 14:30:00", function(event) {
+      $(this).text(
+        event.strftime('%D days %H:%M:%S')
+      );
+    });
+    </script>
+
+  </body>
+</html>
@@ -39,6 +39,7 @@ <h1>Information Security Laboratory</h1>
           <li><b>2017</b>:
               [<a href="https://github.com/KAIST-IS521/2017-Spring">Git</a>]
               [<a href="http://softsec.kaist.ac.kr/courses/2017s-is521/">Web</a>]
+              [<a href="./ctf/2017/">CTF</a>]
           </li>
       </ul>
       </p>