diff --git a/kakom-ti/index.php b/kakom-ti/index.php
index b605a9c..f97bed2 100644
--- a/kakom-ti/index.php
+++ b/kakom-ti/index.php
@@ -31,6 +31,9 @@ include "../includes/courses.php";
   <header>
     <h3><a href="https://docs.google.com/spreadsheet/pub?key=0AvhuiUaiIBYmdHVTME82UTlmMkllZHRVTU8xZ3hzVEE&amp;output=html">Nilai Sementara</a></h3>
   </header>
+  <header>
+    <h3><a href="PRESENTASI">Daftar Topik</a></h3>
+  </header>
 </section>
 <section class="classinfo">
   <section class="notice">
diff --git a/kakom-ti/symmetric_cryptography-1.pdf b/kakom-ti/symmetric_cryptography-1.pdf
new file mode 100644
index 0000000..805748c
Binary files /dev/null and b/kakom-ti/symmetric_cryptography-1.pdf differ
diff --git a/kakom-ti/symmetric_cryptography-2.pdf b/kakom-ti/symmetric_cryptography-2.pdf
new file mode 100644
index 0000000..b79d2b3
Binary files /dev/null and b/kakom-ti/symmetric_cryptography-2.pdf differ