diff --git a/ndn-cpp/fields/signed-blob.h b/ndn-cpp/fields/signed-blob.h
new file mode 100644
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+++ b/ndn-cpp/fields/signed-blob.h
@@ -0,0 +1,98 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ *                     Alexander Afanasyev
+ *                     Zhenkai Zhu
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef NDN_SIGNED_BLOB_H
+#define NDN_SIGNED_BLOB_H
+
+#include "blob.h"
+
+namespace ndn {
+
+/**
+ * @brief Class representing a blob, which has a signed portion (e.g., bytes of DATA packet)
+ */
+class SignedBlob : public Blob
+{
+public:
+  /**
+   * @brief Set signed portion of the blob
+   * @param offset An offset from the beginning of the blob
+   * @param size Size of the signed portion of the blob
+   */
+  inline void
+  setSignedPortion (size_t offset, size_t size);
+  
+  /**
+   * @brief Get begin iterator to a signed portion of the blob
+   */
+  inline const_iterator
+  signed_begin () const;
+
+  /**
+   * @brief Get end iterator of a signed portion of the blob
+   */
+  inline const_iterator
+  signed_end () const;
+
+  /**
+   * @brief Get pointer to a first byte of the signed blob
+   */
+  inline const char*
+  signed_buf () const;
+
+  /**
+   * @brief Get size of the signed blob
+   */
+  inline size_t
+  signed_size () const;
+
+private:
+  const_iterator m_signedBegin;
+  const_iterator m_signedEnd;
+};
+
+
+inline void
+SignedBlob::setSignedPortion (size_t offset, size_t size)
+{
+  m_signedBegin = begin () + offset;
+  m_signedEnd = begin () + offset + size;
+}
+  
+inline SignedBlob::const_iterator
+SignedBlob::signed_begin () const
+{
+  return m_signedBegin;
+}
+
+inline SignedBlob::const_iterator
+SignedBlob::signed_end () const
+{
+  return m_signedEnd;
+}
+
+inline const char*
+SignedBlob::signed_buf () const
+{
+  return &*m_signedBegin;
+}
+
+inline size_t
+SignedBlob::signed_size () const
+{
+  return m_signedEnd - m_signedBegin;
+}
+
+
+} // ndn
+
+#endif // NDN_SIGNED_BLOB_H