diff --git a/ndn-cpp/security/certificate/oid.cpp b/ndn-cpp/security/certificate/oid.cpp
new file mode 100644
index 0000000..6ae1942
--- /dev/null
+++ b/ndn-cpp/security/certificate/oid.cpp
@@ -0,0 +1,67 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/**
+ * Copyright (C) 2013 Regents of the University of California.
+ * @author: Jeff Thompson <jefft0@remap.ucla.edu>
+ * See COPYING for copyright and distribution information.
+ */
+
+#include <stdlib.h>
+#include <sstream>
+
+#include "oid.hpp"
+
+using namespace std;
+
+namespace ndn {
+
+OID::OID(const string& oid)
+{
+  string str = oid + ".";
+
+  size_t pos = 0;
+  size_t ppos = 0;
+
+  while(string::npos != pos){
+    ppos = pos;
+
+    pos = str.find_first_of('.', pos);
+    if(pos == string::npos)
+	    break;
+
+    oid_.push_back(atoi(str.substr(ppos, pos - ppos).c_str()));
+
+    pos++;
+  }
+}
+
+string OID::toString()
+{
+  ostringstream convert;
+  
+  vector<int>::iterator it = oid_.begin();
+  for(; it < oid_.end(); it++){
+    if(it != oid_.begin())
+      convert << ".";
+    convert << *it;
+  }
+  
+  return convert.str();
+}
+
+bool OID::equal(const OID& oid)
+{
+  vector<int>::const_iterator i = oid_.begin();
+  vector<int>::const_iterator j = oid.oid_.begin();
+    
+  for (; i != oid_.end () && j != oid.oid_.end (); i++, j++) {
+    if(*i != *j)
+      return false;
+  }
+
+  if (i == oid_.end () && j == oid.oid_.end ())
+    return true;
+  else
+    return false;
+}
+
+}