diff --git a/ndn-cpp/security/certificate/public-key.hpp b/ndn-cpp/security/certificate/public-key.hpp
new file mode 100644
index 0000000..7db3f49
--- /dev/null
+++ b/ndn-cpp/security/certificate/public-key.hpp
@@ -0,0 +1,72 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/**
+ * Copyright (C) 2013 Regents of the University of California.
+ * @author: Yingdi Yu <yingdi@cs.ucla.edu>
+ * @author: Jeff Thompson <jefft0@remap.ucla.edu>
+ * See COPYING for copyright and distribution information.
+ */
+
+#ifndef NDN_PUBLIC_KEY_HPP
+#define	NDN_PUBLIC_KEY_HPP
+
+#include "../../util/blob.hpp"
+#include "oid.hpp"
+#include "../security-common.hpp"
+
+namespace ndn {
+
+class PublicKey {
+public:    
+  /**
+   * The default constructor.
+   */
+  PublicKey() {}
+
+  /**
+   * Constructor
+   * @param algorithm The algorithm of the public key.
+   * @param keyDer The blob of the PublicKeyInfo in terms of DER.
+   */
+  PublicKey(const OID& algorithm, const Blob& keyDer)
+  : algorithm_(algorithm), keyDer_(keyDer)
+  {
+  }
+
+#if 0
+  /**
+   * Encode the public key into DER.
+   * @return the encoded DER syntax tree.
+   */
+  Ptr<der::DerNode>
+  toDer();
+#endif
+
+  /**
+   * Decode the public key from DER blob.
+   * @param keyDer The DER blob.
+   * @return The decoded public key.
+   */
+  static ptr_lib::shared_ptr<PublicKey>
+  fromDer(const Blob& keyDer);
+
+  /*
+   * @brief get the digest of the public key
+   * @param digestAlgorithm The digest algorithm. If omitted, use DIGEST_SHA256 by default.
+   */
+  Blob 
+  getDigest(DigestAlgorithm digestAlgorithm = DIGEST_ALGORITHM_SHA256) const;
+
+  /*
+   * Get the raw bytes of the public key in DER format.
+   */
+  const Blob& 
+  getKeyDer() const { return keyDer_; }
+    
+private:
+  OID algorithm_; /**< Algorithm */
+  Blob keyDer_;   /**< PublicKeyInfo in DER */
+};
+
+}
+
+#endif