diff --git a/model/ndn-content-object.cc b/model/ndn-content-object.cc
index 544d48c..d9926ef 100644
--- a/model/ndn-content-object.cc
+++ b/model/ndn-content-object.cc
@@ -45,6 +45,7 @@
 }
 
 ContentObject::ContentObject ()
+  : m_signature (0)
 {
 }
 
@@ -98,11 +99,25 @@
   return m_freshness;
 }
 
+void
+ContentObject::SetSignature (uint32_t signature)
+{
+  m_signature = signature;
+}
+
+uint32_t
+ContentObject::GetSignature () const
+{
+  return m_signature;
+}
 
 uint32_t
 ContentObject::GetSerializedSize () const
 {
   uint32_t size = 2 + ((2 + 2) + (m_name->GetSerializedSize ()) + (2 + 2 + 4 + 2 + 2 + (2 + 0)));
+  if (m_signature != 0)
+    size += 4;
+  
   NS_LOG_INFO ("Serialize size = " << size);
   return size;
 }
@@ -113,8 +128,17 @@
   start.WriteU8 (0x80); // version
   start.WriteU8 (0x01); // packet type
 
-  start.WriteU16 (2); // signature length
-  start.WriteU16 (0); // empty signature
+  if (m_signature != 0)
+    {
+      start.WriteU16 (6); // signature length
+      start.WriteU16 (0xFF00); // "fake" simulator signature
+      start.WriteU32 (m_signature);
+    }
+  else
+    {
+      start.WriteU16 (2); // signature length
+      start.WriteU16 (0); // empty signature
+    }
 
   // name
   uint32_t offset = m_name->Serialize (start);
@@ -145,10 +169,20 @@
   if (i.ReadU8 () != 0x01)
     throw new ContentObjectException ();
 
-  if (i.ReadU16 () != 2) // signature length
-    throw new ContentObjectException ();
-  
-  if (i.ReadU16 () != 0) // signature type
+  uint32_t signatureLength = i.ReadU16 ();
+  if (signatureLength == 6)
+    {
+      if (i.ReadU16 () != 0xFF00) // signature type
+        throw new ContentObjectException ();
+      m_signature = i.ReadU32 ();
+    }
+  else if (signatureLength == 2)
+    {
+      if (i.ReadU16 () != 0) // signature type
+        throw new ContentObjectException ();
+      m_signature = 0;
+    }
+  else
     throw new ContentObjectException ();
 
   m_name = Create<Name> ();
diff --git a/model/ndn-content-object.h b/model/ndn-content-object.h
index 78b6e69..9803efe 100644
--- a/model/ndn-content-object.h
+++ b/model/ndn-content-object.h
@@ -137,6 +137,23 @@
   Time
   GetFreshness () const;
 
+  /**
+   * @brief Set "fake" signature on the content object
+   * @param signature  uint32_t number, simulating content object signature
+   *
+   * Values for the signature totally depend on the application
+   */
+  void
+  SetSignature (uint32_t signature);
+
+  /**
+   * @brief Get "fake" signature of the content object
+   *
+   * Values for the signature totally depend on the application
+   */
+  uint32_t
+  GetSignature () const;
+
   //////////////////////////////////////////////////////////////////
 
   static TypeId GetTypeId (void); ///< @brief Get TypeId
@@ -150,6 +167,7 @@
   Ptr<Name> m_name;
   Time m_freshness;
   Time m_timestamp;
+  uint32_t m_signature; // 0, means no signature, any other value application dependent (not a real signature)
 };
 
 typedef ContentObject ContentObjectHeader;
diff --git a/test/ndnSIM-serialization.cc b/test/ndnSIM-serialization.cc
index 2d42d93..1f1d2d6 100644
--- a/test/ndnSIM-serialization.cc
+++ b/test/ndnSIM-serialization.cc
@@ -82,6 +82,13 @@
   source.SetTimestamp (Seconds (100));
   NS_TEST_ASSERT_MSG_EQ (source.GetTimestamp (), Seconds (100), "set/get timestamp failed");
 
+  NS_TEST_ASSERT_MSG_EQ (source.GetSignature (), 0, "initialization of signature failed");
+  int size = source.GetSerializedSize ();  
+  source.SetSignature (10);
+  NS_TEST_ASSERT_MSG_EQ (source.GetSignature (), 10, "set/get signature failed");
+
+  NS_TEST_ASSERT_MSG_EQ (source.GetSerializedSize (), size + 4, "Signature size should have increased by 4");
+  
   Packet packet (0);
   //serialization
   packet.AddHeader (source);
@@ -93,6 +100,7 @@
   NS_TEST_ASSERT_MSG_EQ (source.GetName ()     , target.GetName ()     , "source/target name failed");
   NS_TEST_ASSERT_MSG_EQ (source.GetFreshness (), target.GetFreshness (), "source/target freshness failed");
   NS_TEST_ASSERT_MSG_EQ (source.GetTimestamp (), target.GetTimestamp (), "source/target timestamp failed");
+  NS_TEST_ASSERT_MSG_EQ (source.GetSignature (), target.GetSignature (), "source/target signature failed");
 }
 
 }