diff --git a/model/ndn-content-object-header.h b/model/ndn-content-object-header.h
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2011 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Ilya Moiseenko <iliamo@cs.ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef _NDN_CONTENT_OBJECT_HEADER_H_
+#define _NDN_CONTENT_OBJECT_HEADER_H_
+
+#include "ns3/integer.h"
+#include "ns3/header.h"
+#include "ns3/simple-ref-count.h"
+#include "ns3/trailer.h"
+#include "ns3/nstime.h"
+
+#include <string>
+#include <vector>
+#include <list>
+
+#include "ndn-name-components.h"
+
+namespace ns3
+{
+
+/**
+ * Ndn XML definition of ContentObject
+ * 
+ * Only few important fields are actually implemented in the simulation
+ *
+ *
+ * ContentObjectHeader serializes/deserializes header up-to and including <Content> tags
+ * Necessary closing tags should be added using ContentObjectTail
+ *
+ * This hacks are necessary to optimize memory use (i.e., virtual payload)
+ *
+ * "<ContentObject><Signature>..</Signature><Name>...</Name><SignedInfo>...</SignedInfo><Content>"
+ * 
+ */
+class NdnContentObjectHeader : public SimpleRefCount<NdnContentObjectHeader,Header>
+{
+public:
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+  /**
+   * @brief Class representing Signature section of the content object
+   */
+  class Signature
+  {
+  public:
+    /**
+     * @brief Default constructor. Creates a fake-type signature
+     */
+    inline Signature ();
+
+    /**
+     * @brief Get digest algorithm
+     */
+    inline const std::string &
+    GetDigestAlgorithm () const;
+
+    /**
+     * @brief Set digest algorithm
+     */
+    inline void
+    SetDigestAlgorithm (const std::string &digestAlgorithm);
+
+    /**
+     * @brief Get signature bits
+     */
+    inline uint32_t
+    GetSignatureBits () const;
+
+    /**
+     * @brief Set signature bits
+     */
+    inline void
+    SetSignatureBits (uint32_t signatureBits);
+
+    /**
+     * @brief Default digest algorithm ("2.16.840.1.101.3.4.2.1")
+     */
+    static const std::string DefaultDigestAlgorithm; // = "2.16.840.1.101.3.4.2.1";
+    
+  private:
+    std::string m_digestAlgorithm; // if value is `2.16.840.1.101.3.4.2.1`, then SHA-256 (not supported)
+                                   // in NS-3 value `99.0` represents a fake digest
+    // Witness // not used in NS-3
+    uint32_t m_signatureBits; // in NS-3 a fake signature is a just 32-bits
+  };
+  
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+
+  /**
+   * @brief Options for the data packet Type
+   */
+  enum ContentType
+    {
+      DATA = 0x0C04C0, // default value. If ContentObject is type of DATA, then ContentType tag will be omitted
+      ENCR = 0x10D091,
+      GONE = 0x18E344,
+      KEY  = 0x28463F,
+      LINK = 0x2C834A,
+      NACK = 0x34008A
+    };
+
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+
+  /**
+   * @brief Class representing SignedInfo section of the content object
+   */
+  class SignedInfo
+  {
+  public:
+    /**
+     * @brief Default constructor
+     */
+    SignedInfo (); 
+    
+    /**
+     * @brief Set PublisherPublicKey digest
+     * @param digest a fake 32-bit digest is supported
+     */
+    void
+    SetPublisherPublicKeyDigest (uint32_t digest);
+
+    /**
+     * @brief Get PublisherPublicKey digest
+     */
+    uint32_t
+    GetPublisherPublicKeyDigest () const;
+
+    /**
+     * @brief Set content object timestamp
+     * @param timestamp timestamp
+     */
+    void
+    SetTimestamp (const Time &timestamp);
+
+    /**
+     * @brief Get timestamp of the content object
+     */
+    Time
+    GetTimestamp () const;
+
+    /**
+     * @brief Set ContentObject type
+     * @param type type of the content object
+     */
+    void
+    SetContentType (ContentType type);
+
+    /**
+     * @brief Get ContentObject type
+     */
+    ContentType
+    GetContentType () const;
+    
+    /**
+     * @brief Set freshness of the content object
+     * @param freshness Freshness, 0s means infinity
+     */
+    void
+    SetFreshness (const Time &freshness);
+
+    /**
+     * @brief Get freshness of the content object
+     */
+    Time
+    GetFreshness () const;
+
+    /**
+     * @brief Set key locator
+     * @param keyLocator name of the key
+     *
+     * Note that only <KeyName> option for the key locator is supported
+     */
+    void
+    SetKeyLocator (Ptr<const NdnNameComponents> keyLocator);
+
+    /**
+     * @brief Get key locator
+     *
+     * Note that only <KeyName> option for the key locator is supported
+     */
+    Ptr<const NdnNameComponents>
+    GetKeyLocator () const;
+    
+  private:
+    uint32_t m_publisherPublicKeyDigest; // fake publisher key digest
+    Time m_timestamp;
+    ContentType m_type;
+    Time m_freshness;
+    // FinalBlockID
+    Ptr<const NdnNameComponents> m_keyLocator; // support only <KeyName> option for KeyLocator
+  };
+
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+  ////////////////////////////////////////////////////////////////////////////  
+
+  /**
+   * Constructor
+   *
+   * Creates a null header
+   **/
+  NdnContentObjectHeader ();
+
+  /**
+   * \brief Set content object name
+   *
+   * Sets name of the content object. For example, SetName( NdnNameComponents("prefix")("postfix") );
+   **/
+  void
+  SetName (const Ptr<NdnNameComponents> &name);
+
+  /**
+   * @brief Get name of the content object
+   */
+  const NdnNameComponents&
+  GetName () const;
+
+  /**
+   * @brief Get smart pointer to the interest name (to avoid extra memory usage)
+   */
+  Ptr<const NdnNameComponents>
+  GetNamePtr () const;
+
+  /**
+   * @brief Get editable reference to content object's Signature
+   */
+  inline Signature &
+  GetSignature ();
+
+  /**
+   * @brief Get read-only reference to content object's Signature
+   */
+  inline const Signature &
+  GetSignature () const;
+
+  /**
+   * @brief Get editable reference to content object's SignedInfo
+   */
+  inline SignedInfo &
+  GetSignedInfo ();
+
+  /**
+   * @brief Get read-only reference to content object's SignedInfo
+   */
+  inline const SignedInfo &
+  GetSignedInfo () const;
+  
+  //////////////////////////////////////////////////////////////////
+  
+  static TypeId GetTypeId (void); ///< @brief Get TypeId
+  virtual TypeId GetInstanceTypeId (void) const; ///< @brief Get TypeId of the instance
+  virtual void Print (std::ostream &os) const; ///< @brief Print out information about the Header into the stream
+  virtual uint32_t GetSerializedSize (void) const; ///< @brief Get size necessary to serialize the Header
+  virtual void Serialize (Buffer::Iterator start) const; ///< @brief Serialize the Header
+  virtual uint32_t Deserialize (Buffer::Iterator start); ///< @brief Deserialize the Header
+  
+private:
+  Signature  m_signature;
+  Ptr<NdnNameComponents> m_name;
+  SignedInfo m_signedInfo;
+};
+
+/**
+ * ContentObjectTail should always be 2 bytes, representing two closing tags:
+ * "</Content><ContentObject>"
+ */
+class NdnContentObjectTail : public Trailer
+{
+public:
+  NdnContentObjectTail ();
+  //////////////////////////////////////////////////////////////////
+  
+  static TypeId GetTypeId (void); ///< @brief Get TypeId
+  virtual TypeId GetInstanceTypeId (void) const; ///< @brief Get TypeId of the instance
+  virtual void Print (std::ostream &os) const; ///< @brief Print out information about Tail into the stream
+  virtual uint32_t GetSerializedSize (void) const; ///< @brief Get size necessary to serialize the Tail
+  virtual void Serialize (Buffer::Iterator start) const; ///< @brief Serialize the Tail
+  virtual uint32_t Deserialize (Buffer::Iterator start); ///< @brief Deserialize the Tail
+};
+
+
+NdnContentObjectHeader::Signature::Signature ()
+  : m_digestAlgorithm ("99.0")
+  , m_signatureBits (0)
+{
+}
+
+const std::string &
+NdnContentObjectHeader::Signature::GetDigestAlgorithm () const
+{
+  return m_digestAlgorithm;
+}
+
+void
+NdnContentObjectHeader::Signature::SetDigestAlgorithm (const std::string &digestAlgorithm)
+{
+  m_digestAlgorithm = digestAlgorithm;
+}
+
+uint32_t
+NdnContentObjectHeader::Signature::GetSignatureBits () const
+{
+  return m_signatureBits;
+}
+
+inline void
+NdnContentObjectHeader::Signature::SetSignatureBits (uint32_t signature)
+{
+  m_signatureBits = signature;
+}
+
+
+NdnContentObjectHeader::Signature &
+NdnContentObjectHeader::GetSignature ()
+{
+  return m_signature;
+}
+
+const NdnContentObjectHeader::Signature &
+NdnContentObjectHeader::GetSignature () const
+{
+  return m_signature;
+}
+
+NdnContentObjectHeader::SignedInfo &
+NdnContentObjectHeader::GetSignedInfo ()
+{
+  return m_signedInfo;
+}
+
+const NdnContentObjectHeader::SignedInfo &
+NdnContentObjectHeader::GetSignedInfo () const
+{
+  return m_signedInfo;
+}
+
+/**
+ * @brief Class for ContentObject parsing exception 
+ */
+class NdnContentObjectHeaderException {};
+
+} // namespace ns3
+
+#endif // _NDN_CONTENT_OBJECT_HEADER_H_