diff --git a/ndn-cpp/security/verifier.h b/ndn-cpp/security/verifier.h
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ *                     Alexander Afanasyev
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef NDN_VERIFIER_H
+#define NDN_VERIFIER_H
+
+namespace ndn {
+
+/**
+ * @brief Interface for NDN DATA packet verification (trust model)
+ *
+ * --- interface to verify DATA packets
+ *     - application selects required implementation
+ *     - at least two build-in models:
+ *       = hierarchical (default)
+ *       = simple chain (without authorization)
+ *     - uses NDN keychain as a backend to cache certificates
+ */
+class Verifier
+{
+public:
+  /**
+   * @brief Virtual destructor
+   */
+  virtual
+  ~Verifier ();
+};
+
+} // ndn
+
+#endif // NDN_VERIFIER_H