diff --git a/virtualsmartcard/src/vpicc/virtualsmartcard/CardGenerator.py b/virtualsmartcard/src/vpicc/virtualsmartcard/CardGenerator.py
index 5dd6d2c..e136185 100644
--- a/virtualsmartcard/src/vpicc/virtualsmartcard/CardGenerator.py
+++ b/virtualsmartcard/src/vpicc/virtualsmartcard/CardGenerator.py
@@ -17,7 +17,7 @@
 # virtualsmartcard.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-import sys, getpass, anydbm, readline
+import sys, getpass, anydbm, readline, logging
 from pickle import loads, dumps
 from virtualsmartcard.TLVutils import pack
 from virtualsmartcard.utils import inttostring
@@ -45,9 +45,13 @@ class CardGenerator(object):
         self.sam = sam
     
     def __generate_iso_card(self):
-        print "Using default SAM. Insecure!!!"
+        default_pin = "1234"
+        default_cardno = "1234567890"
+        
+        logging.warning("Using default SAM parameters. PIN=%s, Card Nr=%s"
+                        & (default_pin, default_cardno))
         #TODO: Use user provided data
-        self.sam = virtualsmartcard.SmartcardSAM.SAM("1234", "1234567890")
+        self.sam = virtualsmartcard.SmartcardSAM.SAM(default_pin, default_cardno)
         
         self.mf = MF(filedescriptor=FDB["DF"])
         self.sam.set_MF(self.mf)
@@ -74,7 +78,7 @@ class CardGenerator(object):
             picture = fd.read()
             fd.close()
         except IOError:
-            print "Failed to open file: " + picturepath
+            logging.warning("Failed to open file: " + picturepath)
             pic_width = 0
             pic_height = 0
             picture = None  
@@ -212,7 +216,7 @@ if __name__ == "__main__":
     (options, args) = parser.parse_args()
 
     if options.filename == None:
-        print "You have to provide a filename using the -f option"
+        logging.error("You have to provide a filename using the -f option")
         sys.exit()
     
     generator = CardGenerator(options.type)
diff --git a/virtualsmartcard/src/vpicc/virtualsmartcard/CryptoUtils.py b/virtualsmartcard/src/vpicc/virtualsmartcard/CryptoUtils.py
index e03524e..4f4d8b4 100644
--- a/virtualsmartcard/src/vpicc/virtualsmartcard/CryptoUtils.py
+++ b/virtualsmartcard/src/vpicc/virtualsmartcard/CryptoUtils.py
@@ -16,14 +16,13 @@
 # You should have received a copy of the GNU General Public License along with
 # virtualsmartcard.  If not, see <http://www.gnu.org/licenses/>.
 #
-import sys, binascii, utils, random
-from Crypto.Cipher import DES3, DES, AES, ARC4 #,IDEA no longer present in python-crypto?
+import sys, binascii, utils, random, logging
+from Crypto.Cipher import DES3, DES, AES, ARC4 #,IDEA no longer present in python-crypto? @UnusedImport
 from struct import pack
 from binascii import b2a_hex, a2b_hex
 from random import randint
-from virtualsmartcard.utils import inttostring, stringtoint, hexdump
-import string
-import re
+from virtualsmartcard.utils import inttostring, hexdump
+import string, re
 
 try:
     # Use PyCrypto (if available)
@@ -166,7 +165,7 @@ def hash(hashmethod, data):
     from Crypto.Hash import SHA, MD5#, RIPEMD
     hash_class = locals().get(hashmethod.upper(), None)
     if hash_class == None:
-        print "Unknown Hash method %s" % hashmethod
+        logging.error("Unknown Hash method %s" % hashmethod)
         raise ValueError
     hash = hash_class.new()
     hash.update(data)
@@ -231,7 +230,7 @@ def read_protected_string(string, password, cipherspec=None):
     #Verify HMAC
     checksum = crypto_checksum("HMAC", key, crypted)
     if checksum != hmac:
-        print "Found HMAC %s expected %s" % (str(hmac), str(checksum))
+        logging.error("Found HMAC %s expected %s" % (str(hmac), str(checksum)))
         raise ValueError, "Failed to authenticate data. Wrong password?"
     
     #Decrypt data
diff --git a/virtualsmartcard/src/vpicc/virtualsmartcard/SmartcardFilesystem.py b/virtualsmartcard/src/vpicc/virtualsmartcard/SmartcardFilesystem.py
index 0270a7c..d9b0567 100644
--- a/virtualsmartcard/src/vpicc/virtualsmartcard/SmartcardFilesystem.py
+++ b/virtualsmartcard/src/vpicc/virtualsmartcard/SmartcardFilesystem.py
@@ -21,6 +21,7 @@
 @todo zu lange daten abschneiden und trotzdem tlv laenge beibehalten
 """
 from pickle import dumps, loads
+import logging
 from virtualsmartcard.ConstantDefinitions import *
 from virtualsmartcard.TLVutils import *
 from virtualsmartcard.SWutils import *
@@ -481,9 +482,9 @@ class DF(File): # {{{
                 return file
         # not found
         if isinstance(value, int):
-            print "file not found %s=%x" % (attribute, value)
+            logging.debug("file not found %s=%x" % (attribute, value))
         elif isinstance(value, str):
-            print "file not found %s=%r" % (attribute, value)
+            logging.debug("file not found %s=%r" % (attribute, value))
         raise SwError(SW["ERR_FILENOTFOUND"])
 
     def remove(self, file):
@@ -674,7 +675,7 @@ class MF(DF): # {{{
             selected = self.select('dfname', data, p2 &
                     REF["REFERENCE_CONTROL"], index_current)
         else:
-            print "unknown selection method: p1 =", p1
+            logging.debug("unknown selection method: p1 =%s" % p1)
             selected = None
 
         if selected == None:
@@ -1219,7 +1220,7 @@ class MF(DF): # {{{
                 if shortfid != 0:
                     args["shortfid"] = shortfid
         def unknown(tag, value):
-            print "unknown tag 0x%x with %r" % tag, value
+            logging.debug("unknown tag 0x%x with %r" % (tag, value))
         tag2cmd = {
                 # TODO support other tags
                 TAG["FILEDISCRIPTORBYTE"]       : 'fdb2args(value, args)',
@@ -1250,7 +1251,7 @@ class MF(DF): # {{{
             if (args["filedescriptor"] & FDB["DF"]) == FDB["DF"]:
                 # FIXME: data for DF
                 if "data" in args:
-                    print 'what to do with DF-data %r?' % args["data"]
+                    logging.debug('what to do with DF-data %r?' % args["data"])
                     del args["data"]
                 file = DF(**args)
             elif ((args["filedescriptor"] & 7) in
diff --git a/virtualsmartcard/src/vpicc/virtualsmartcard/SmartcardSAM.py b/virtualsmartcard/src/vpicc/virtualsmartcard/SmartcardSAM.py
index 1c29273..6600750 100644
--- a/virtualsmartcard/src/vpicc/virtualsmartcard/SmartcardSAM.py
+++ b/virtualsmartcard/src/vpicc/virtualsmartcard/SmartcardSAM.py
@@ -17,7 +17,7 @@
 # virtualsmartcard.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-import struct, hashlib
+import struct, hashlib, logging
 from pickle import dumps, loads
 from os import urandom
 
@@ -122,7 +122,7 @@ class SAM(object):
         equals zero, block the card until reset with correct PUK
         """
         
-        print "Received PIN: %s" % PIN.strip()
+        logging.debug("Received PIN: %s" % PIN.strip())
         PIN = PIN.replace("\0","") #Strip NULL charakters
         
         if p1 != 0x00:
@@ -145,7 +145,6 @@ class SAM(object):
         
         data = data.replace("\0","") #Strip NULL charakters
         self.PIN = data
-        print "New PIN = %s" % self.PIN
         return SW["NORMAL"], ""    
 
     def internal_authenticate(self, p1, p2, data):
@@ -171,7 +170,7 @@ class SAM(object):
     
     def external_authenticate(self, p1, p2, data):
         """
-        Authenticate the terminal to the card. Check wether Terminal correctly
+        Authenticate the terminal to the card. Check whether Terminal correctly
         encrypted the given challenge or not
         """
         if self.last_challenge is None:
@@ -190,10 +189,6 @@ class SAM(object):
             self.last_challenge = None
             return SW["NORMAL"], ""
         else:
-            plain = vsCrypto.decrypt(cipher, key, data)
-            print plain
-            print "Reference: " + hexdump(reference)
-            print "Data: " + hexdump(data)
             raise SwError(SW["WARN_NOINFO63"])
             #TODO: Counter for external authenticate?
 
@@ -201,7 +196,7 @@ class SAM(object):
         """
         Takes an encrypted challenge in the form 
         'Terminal Challenge | Card Challenge | Card number'
-        and checks it for validity. If the challenge is succesful
+        and checks it for validity. If the challenge is successful
         the card encrypts 'Card Challenge | Terminal challenge' and
         returns this value
         """
@@ -242,7 +237,7 @@ class SAM(object):
         
         length = 8 #Length of the challenge in Byte
         self.last_challenge = urandom(length)
-        print "Generated challenge: %s" % str(self.last_challenge)
+        logging.debug("Generated challenge: %s" % str(self.last_challenge))
         self.last_challenge = inttostring(self.last_challenge, length)
 
         return SW["NORMAL"], self.last_challenge
@@ -282,7 +277,7 @@ class SAM(object):
             df = self.mf.currentDF()
             fid = df.select("fid", stringtoint(qualifier))
             key = fid.readbinary(keylength)
- 			              
+
         if key != None:
             return key
         else: 
@@ -1056,8 +1051,8 @@ class CryptoflexSM(Secure_Messaging):
 
         e_in = struct.unpack("<i", data)
         if e_in[0] != 65537:
-            print "Warning: Exponents different from 65537 are ignored!" +\
-                  "The Exponent given is %i" % e_in[0]
+            logging.warning("Warning: Exponents different from 65537 are ignored!" +\
+                            "The Exponent given is %i" % e_in[0])
 
         #Encode Public key
         n = PublicKey.__getstate__()['n']
diff --git a/virtualsmartcard/src/vpicc/virtualsmartcard/VirtualSmartcard.py b/virtualsmartcard/src/vpicc/virtualsmartcard/VirtualSmartcard.py
index 943e6e2..bccb7cb 100644
--- a/virtualsmartcard/src/vpicc/virtualsmartcard/VirtualSmartcard.py
+++ b/virtualsmartcard/src/vpicc/virtualsmartcard/VirtualSmartcard.py
@@ -23,7 +23,7 @@ from virtualsmartcard.SmartcardFilesystem import make_property
 from virtualsmartcard.utils import C_APDU, R_APDU, hexdump, inttostring
 import CardGenerator
 
-import socket, struct, sys, signal, atexit, smartcard
+import socket, struct, sys, signal, atexit, smartcard, logging
 
 
 class SmartcardOS(object): # {{{
@@ -246,7 +246,7 @@ class Iso7816OS(SmartcardOS): # {{{
         try:
             c = C_APDU(msg)
         except ValueError, e:
-            print e
+            logging.warning(str(e))
             return self.formatResult(0, "", SW["ERR_INCORRECTPARAMETERS"], False)
 
         #Handle Class Byte{{{
@@ -258,7 +258,7 @@ class Iso7816OS(SmartcardOS): # {{{
         
         #Ugly Hack for OpenSC-explorer
         if(class_byte == 0xb0):
-            print "Open SC APDU"
+            logging.debug("Open SC APDU")
             SM_STATUS = "No SM"
         
         #If Bit 8,7,6 == 0 then first industry values are used
@@ -305,7 +305,7 @@ class Iso7816OS(SmartcardOS): # {{{
             else:
                 answer = self.formatResult(c.effective_Le, result, sw, False)
         except SwError, e:
-            print e.message
+            logging.info(e.message)
             #traceback.print_exception(*sys.exc_info())
             sw = e.sw
             result = ""
@@ -326,14 +326,14 @@ class CryptoflexOS(Iso7816OS): # {{{
         try:
             c = C_APDU(msg)
         except ValueError, e:
-            print e
+            logging.debug("Failed to parse APDU %s" % msg)
             return self.formatResult(0, 0, "", SW["ERR_INCORRECTPARAMETERS"])
 
         try:
             sw, result = self.ins2handler.get(c.ins, notImplemented)(c.p1, c.p2, c.data)
             #print type(result)
         except SwError, e:
-            print e.message
+            logging.info(e.message)
             #traceback.print_exception(*sys.exc_info())
             sw = e.sw
             result = ""
@@ -366,7 +366,8 @@ class RelayOS(SmartcardOS): # {{{
     def __init__(self, readernum):
         readers = smartcard.System.listReaders()
         if len(readers) <= readernum:
-            print "Invalid number of reader '%u' (only %u available)" % (readernum, len(readers))
+            logging.error("Invalid number of reader '%u' (only %u available)"
+                          % (readernum, len(readers)))
             sys.exit()
         # XXX this is a workaround, see on sourceforge bug #3083254
         # should better use
@@ -377,10 +378,10 @@ class RelayOS(SmartcardOS): # {{{
         try:
             self.session = smartcard.Session(self.reader)
         except smartcard.Exceptions.CardConnectionException, e:
-            print "Error connecting to card: %s" % e.message
+            logging.error("Error connecting to card: %s" % e.message)
             sys.exit()
 
-        print "Connected to card in '%s'" % self.reader
+        logging.info("Connected to card in '%s'" % self.reader)
 
         atexit.register(self.cleanup)
 
@@ -388,7 +389,7 @@ class RelayOS(SmartcardOS): # {{{
         try:
             self.session.close()
         except smartcard.Exceptions.CardConnectionException, e:
-            print "Error disconnecting from card: %s" % e.message
+            logging.warning("Error disconnecting from card: %s" % e.message)
 
     def getATR(self):
         try:
@@ -399,7 +400,7 @@ class RelayOS(SmartcardOS): # {{{
                 self.session = smartcard.Session(self.reader)
                 atr = self.session.getATR()
             except smartcard.Exceptions.CardConnectionException, e:
-                print "Error getting ATR: %s" % e.message
+                logging.error("Error getting ATR: %s" % e.message)
                 sys.exit()
 
         return "".join([chr(b) for b in atr])
@@ -411,14 +412,14 @@ class RelayOS(SmartcardOS): # {{{
             try:
                 self.session = smartcard.Session(self.reader)
             except smartcard.Exceptions.CardConnectionException, e:
-                print "Error connecting to card: %s" % e.message
+                logging.error("Error connecting to card: %s" % e.message)
                 sys.exit()
 
     def powerDown(self):
         try:
             self.session.close()
         except smartcard.Exceptions.CardConnectionException, e:
-            print "Error disconnecting from card: %s" % str(e)
+            logging.error("Error disconnecting from card: %s" % str(e))
             sys.exit()
 
     def execute(self, msg):
@@ -430,7 +431,7 @@ class RelayOS(SmartcardOS): # {{{
         try:
             rapdu, sw1, sw2 = self.session.sendCommandAPDU(apdu)
         except smartcard.Exceptions.CardConnectionException, e:
-            print "Error transmitting APDU: %s" % str(e)
+            logging.error("Error transmitting APDU: %s" % str(e))
             sys.exit()
 
         # XXX this is a workaround, see on sourceforge bug #3083586
@@ -462,6 +463,10 @@ class VirtualICC(object): # {{{
     def __init__(self, filename, type, host, port, lenlen=3, readernum=None):
         from os.path import exists
         
+        logging.basicConfig(level = logging.INFO, 
+                            format = "%(asctime)s  [%(levelname)s] %(message)s", 
+                            datefmt = "%d.%m.%Y %H:%M:%S") 
+        
         self.filename = None
         self.cardGenerator = CardGenerator.CardGenerator(type)
         
@@ -471,7 +476,8 @@ class VirtualICC(object): # {{{
             if exists(filename):
                 self.cardGenerator.loadCard(self.filename)
             else:
-                print "Creating new card which will be saved in %s." % self.filename
+                logging.info("Creating new card which will be saved in %s." 
+                             % self.filename)
         
         MF, SAM = self.cardGenerator.getCard()
         
@@ -483,7 +489,8 @@ class VirtualICC(object): # {{{
         elif type == "relay":
             self.os = RelayOS(readernum)
         else:
-            print "Unknown cardtype " + type + ". Will use standard ISO 7816 cardtype"
+            logging.warning("Unknown cardtype %s. Will use standard ISO 7816 cardtype"
+                         % type)
             type = "iso7816"
             self.os = Iso7816OS(MF, SAM)
         self.type = type
@@ -493,13 +500,13 @@ class VirtualICC(object): # {{{
             self.sock = self.connectToPort(host, port)
             self.sock.settimeout(None)
         except socket.error, e:
-            print "Failed to open socket: %s" % str(e)
-            print "Is pcscd running at %s? Is vpcd loaded? Is a firewall blocking port %u?" % (host, port)
+            logging.error("Failed to open socket: %s" % str(e))
+            logging.error("Is pcscd running at %s? Is vpcd loaded? Is a firewall blocking port %u?" % (host, port))
             sys.exit()
                        
         self.lenlen = lenlen
 
-        print "Connected to virtual PCD at %s:%u" % (host, port)
+        logging.info("Connected to virtual PCD at %s:%u" % (host, port))
 
         signal.signal(signal.SIGINT, self.signalHandler)
         atexit.register(self.stop)
@@ -523,7 +530,7 @@ class VirtualICC(object): # {{{
         # receive message size
         sizestr = self.sock.recv(_Csizeof_short)
         if len(sizestr) == 0:
-            print "Virtual PCD shut down"
+            logging.info("Virtual PCD shut down")
             sys.exit()
         size = struct.unpack('!H', sizestr)[0]
 
@@ -531,7 +538,7 @@ class VirtualICC(object): # {{{
         if size:
             msg = self.sock.recv(size)
             if len(msg) == 0:
-                print "Virtual PCD shut down"
+                logging.info("Virtual PCD shut down")
         else:
             msg = None
 
@@ -541,28 +548,28 @@ class VirtualICC(object): # {{{
         while True :
             (size, msg) = self.__recvFromVPICC()
             if not size:
-                print "error in communication protocol"
+                logging.warning("Error in communication protocol (missing size parameter)")
             elif size == VPCD_CTRL_LEN:
                 if msg == chr(VPCD_CTRL_OFF):
-                    print "Power Down"
+                    logging.info("Power Down")
                     self.os.powerDown()
                 elif msg == chr(VPCD_CTRL_ON):
-                    print "Power Up"
+                    logging.info("Power Up")
                     self.os.powerUp()
                 elif msg == chr(VPCD_CTRL_RESET):
-                    print "Reset"
+                    logging.info("Reset")
                     self.os.reset()
                 elif msg == chr(VPCD_CTRL_ATR):
                     self.__sendToVPICC(self.os.getATR())
                 else:
-                    print "unknown control command"
+                    logging.warning("unknown control command")
             else:
                 if size != len(msg):
-                    print "Expected APDU of %u bytes, but received only %u" % (size, len(msg))
+                    logging.warning("Expected APDU of %u bytes, but received only %u" % (size, len(msg)))
 
-                print "APDU (%d Bytes):\n%s" % (len(msg), hexdump(msg, short=True))
+                logging.info("APDU (%d Bytes):\n%s" % (len(msg), hexdump(msg, short=True)))
                 answer = self.os.execute(msg)
-                print "RESP (%d Bytes):\n%s\n" % (len(answer), hexdump(answer, short=True))
+                logging.info("RESP (%d Bytes):\n%s\n" % (len(answer), hexdump(answer, short=True)))
                 self.__sendToVPICC(answer)
 
     def stop(self):