diff --git a/mrpkey.py b/mrpkey.py
index 2ffe33b..f6201a5 100755
--- a/mrpkey.py
+++ b/mrpkey.py
@@ -1283,6 +1283,7 @@ def help():
 		if DEBUG or TEST:
 			print 'Auth message: ' + resp
 			print 'Auth MAC: ' + respmac + ' (verified)'
+		tdes= DES3.new(Kenc,DES.MODE_CBC,passport.DES_IV)
 		decresp= passport.ToHex(tdes.decrypt(passport.ToBinary(resp)))
 		if DEBUG or TEST:
 			print 'Decrypted Auth Response: ' + decresp
diff --git a/rfidiot/RFIDIOt.py b/rfidiot/RFIDIOt.py
index 23a1f9f..2e00244 100755
--- a/rfidiot/RFIDIOt.py
+++ b/rfidiot/RFIDIOt.py
@@ -81,6 +81,7 @@ def __init__(self,readernum,reader,port,baud,to,debug,noinit,nfcreader):
 		self.DEBUG= debug
 		self.NoInit= noinit
 		self.NFCReader= nfcreader
+		self.timeout= to
 		if not self.NoInit:
 			if self.readertype == self.READER_PCSC:
 				try:
@@ -507,7 +508,7 @@ def __init__(self,readernum,reader,port,baud,to,debug,noinit,nfcreader):
 			    'N':'No precise diagnosis',
 			    'PC00':'No TAG present!',
 			    'PC01':'PCSC Communications Error',
-			    'PN00': 'PN531 Communications Error',
+			    'PN00': 'PN53x Communications Error',
 			    'R':'Block out of range',
 			    'X':'Authentication failed',
 			    }
@@ -1372,7 +1373,7 @@ def libnfc_mifare_login(self,block,key,keytype):
 		   keytype= '%02x' % pynfc.MC_AUTH_A
 		loginblock= '%02x' % block
 		#if self.tagtype == self.ACS_TAG_MIFARE_1K or self.tagtype == self.ACS_TAG_MIFARE_4K:
-		ret, self.errorcode= self.nfc.sendAPDU([keytype]+[loginblock]+[key]+[self.uid])
+		ret, self.errorcode= self.nfc.sendAPDU([keytype]+[loginblock]+[key]+[self.uid], self.timeout)
 		if not ret:
 			self.errorcode= self.ISO_SECURE
 			return False
@@ -1383,7 +1384,7 @@ def libnfc_mifare_read_block(self, block):
 		apdu += '%02X' % pynfc.MC_READ # mifare read
 		hexblock= '%02x' % block
 		apdu.append(hexblock)
-		ret, dat= self.nfc.sendAPDU(apdu)
+		ret, dat= self.nfc.sendAPDU(apdu, self.timeout)
 		if not ret:
 			self.errorcode= dat
 			return False
@@ -1530,10 +1531,13 @@ def send_apdu(self,option,pcb,cid,nad,cla,ins,p1,p2,lc,data,le):
 		if self.readertype == self.READER_LIBNFC:
 			if self.DEBUG:
 				print 'In send_apdu - for libnfc:', cla+ins+p1+p2+lc+data+le
-			ret, result = self.nfc.sendAPDU(cla+ins+p1+p2+lc+data+le)
+			ret, result = self.nfc.sendAPDU(cla+ins+p1+p2+lc+data+le, self.timeout)
+			if not ret:
+				self.errorcode = 'PN00'
+				return False
 			self.data = result[0:-4]
 			self.errorcode = result[len(result)-4:len(result)]
-			if not ret or self.errorcode != self.ISO_OK:
+			if self.errorcode != self.ISO_OK:
 				return False
 			return True
 		if self.readertype == self.READER_ANDROID:
@@ -1708,7 +1712,7 @@ def readblock(self,block):
 			apdu += '%02X' % pynfc.MC_READ # mifare read
 			hexblock= '%04x' % block
 			apdu.append(hexblock)
-			ret, self.errorcode= self.nfc.sendAPDU(apdu)
+			ret, self.errorcode= self.nfc.sendAPDU(apdu, self.timeout)
 			if not ret:
 				return False
 			self.errorcode= self.ISO_OK
diff --git a/rfidiot/pynfc.py b/rfidiot/pynfc.py
index 094b3ec..425e03b 100755
--- a/rfidiot/pynfc.py
+++ b/rfidiot/pynfc.py
@@ -308,8 +308,9 @@ def initlibnfc(self):
 		self.libnfc.nfc_device_get_name.argtypes = [ctypes.c_void_p]
 		self.libnfc.nfc_open.restype = ctypes.c_void_p
 		self.libnfc.nfc_initiator_init.argtypes = [ctypes.c_void_p]
-		self.libnfc.nfc_device_set_property_bool.argtypes = [ctypes.c_void_p, ctypes.c_int, ctypes.c_bool];
+		self.libnfc.nfc_device_set_property_bool.argtypes = [ctypes.c_void_p, ctypes.c_int, ctypes.c_bool]
 		self.libnfc.nfc_close.argtypes = [ctypes.c_void_p]
+		self.libnfc.nfc_perror.argtypes = [ctypes.c_void_p, ctypes.c_char_p]
 		self.libnfc.nfc_initiator_list_passive_targets.argtypes = [ctypes.c_void_p, ctypes.Structure, ctypes.c_void_p, ctypes.c_size_t]
 		self.libnfc.nfc_initiator_transceive_bytes.argtypes = [ctypes.c_void_p, ctypes.c_void_p, ctypes.c_size_t, ctypes.c_void_p, ctypes.c_size_t, ctypes.c_uint32]
 		self.libnfc.nfc_init(ctypes.byref(self.context))
@@ -461,7 +462,7 @@ def configMifare(self):
 		self.libnfc.nfc_device_set_property_bool(self.device, NP_EASY_FRAMING, True)
 		self.selectISO14443A()
 
-	def sendAPDU(self, apdu):
+	def sendAPDU(self, apdu, timeout=None):
 		apdu= "".join([x for x in apdu])
 		txData = []		
 		for i in range(0, len(apdu), 2):
@@ -475,10 +476,11 @@ def sendAPDU(self, apdu):
 	
 		if rfidiotglobals.Debug:	
 			self.log.debug("Sending %d byte APDU: %s" % (len(tx),"".join(["%02x" % x for x in tx])))
-		rxlen = self.libnfc.nfc_initiator_transceive_bytes(self.device, ctypes.byref(tx), ctypes.c_size_t(len(tx)), ctypes.byref(rx), ctypes.c_size_t(len(rx)), -1)
+		rxlen = self.libnfc.nfc_initiator_transceive_bytes(self.device, ctypes.byref(tx), ctypes.c_size_t(len(tx)), ctypes.byref(rx), ctypes.c_size_t(len(rx)), int(timeout * 1000) if timeout is not None else -1)
 		if rfidiotglobals.Debug:
 			self.log.debug('APDU rxlen = ' + str(rxlen))
 		if rxlen < 0:
+			self.libnfc.nfc_perror(self.device, "nfc_initiator_transceive_bytes")
 			if rfidiotglobals.Debug:
 				self.log.error("Error sending/receiving APDU")
 			return False, rxlen