anchor.diff:  			    true;
   			%% OTP-4090 (OTP-3542)
   			false -> 
  +                            ?vlog("Not in time window: "
  +                                  "~n      Sec Name: ~p", [SecName]),
   			    error(usmStatsNotInTimeWindows,
   				  ?usmStatsNotInTimeWindows_instance,
   				  SecName,
  
positive.code: 		{ok, ScopedPduData, MsgPrivParams} ->
  		    {snmp_pdus:enc_oct_str_tag(ScopedPduData), MsgPrivParams};
  		{error, Reason} ->
                      ?vlog("encrypt -> try encrypt error: "
                            "~n      ~p", [Reason]),
  		    error(Reason);
  		_Unexpected ->
                      ?vlog("encrypt -> try encrypt unexpected failure: "
                            "~n      ~p", [_Unexpected]),
  		    error(encryptionError)
  	    end
      end.
  
  try_encrypt(usmNoPrivProtocol, _PrivKey, _Data, _EngineBoots, _EngineTime) -> % 3.1.2
      error(unsupportedSecurityLevel);
  try_encrypt(usmDESPrivProtocol, PrivKey, Data, _EngineBoots, _EngineTime) ->
      des_encrypt(PrivKey, Data);
  
negative.code: 
  	    
  is_auth(usmNoAuthProtocol, _, _, _, SecName, _, _, _) -> % 3.2.5
      ?vlog("auth: Unsupported security levels: "
            "~n      Sec Name: ~p", [SecName]),
      error(usmStatsUnsupportedSecLevels,
  	  ?usmStatsUnsupportedSecLevels_instance, SecName);
  is_auth(AuthProtocol, AuthKey, AuthParams, Packet, SecName,
  