diff --git a/rdpy/core/type.py b/rdpy/core/type.py
index dd838db..5c056ef 100644
--- a/rdpy/core/type.py
+++ b/rdpy/core/type.py
@@ -959,6 +959,13 @@ class ArrayType(Type):
         @param s: Stream
         """
         s.writeType(self._array)
+        
+    def __getitem__(self, item):
+        """
+        @summary: Magic function to be FactoryType as transparent as possible
+        @return: index of _value
+        """
+        return self._array.__getitem__(item)
     
     def __sizeof__(self):
         """
diff --git a/rdpy/core/x509.py b/rdpy/core/x509.py
new file mode 100644
index 0000000..d507b2f
--- /dev/null
+++ b/rdpy/core/x509.py
@@ -0,0 +1,159 @@
+#
+# Copyright (c) 2014 Sylvain Peyrefitte
+#
+# This file is part of rdpy.
+#
+# rdpy is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# 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, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+@see: https://github.com/filippog/pyasn1/blob/master/examples/x509.py
+"""
+
+from pyasn1.type import tag, namedtype, namedval, univ, constraint, char, useful
+from pyasn1.codec.ber import decoder, encoder
+from pyasn1 import error
+from error import InvalidExpectedDataException
+
+MAX = 64
+
+class DirectoryString(univ.Choice):
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('teletexString', char.TeletexString().subtype(subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
+        namedtype.NamedType('printableString', char.PrintableString().subtype(subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
+        namedtype.NamedType('universalString', char.UniversalString().subtype(subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
+        namedtype.NamedType('utf8String', char.UTF8String().subtype(subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
+        namedtype.NamedType('bmpString', char.BMPString().subtype(subtypeSpec=constraint.ValueSizeConstraint(1, MAX))),
+        namedtype.NamedType('ia5String', char.IA5String().subtype(subtypeSpec=constraint.ValueSizeConstraint(1, MAX))) # hm, this should not be here!? XXX
+        )
+
+class AttributeValue(DirectoryString): pass
+
+class AttributeType(univ.ObjectIdentifier): pass
+
+class AttributeTypeAndValue(univ.Sequence):
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('type', AttributeType()),
+        namedtype.NamedType('value', AttributeValue())
+        )
+
+class RelativeDistinguishedName(univ.SetOf):
+    componentType = AttributeTypeAndValue()
+
+class RDNSequence(univ.SequenceOf):
+    componentType = RelativeDistinguishedName()
+
+class Name(univ.Choice):
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('', RDNSequence())
+        )
+                          
+class AlgorithmIdentifier(univ.Sequence):
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('algorithm', univ.ObjectIdentifier()),
+        namedtype.OptionalNamedType('parameters', univ.Null())
+        # XXX syntax screwed?
+#        namedtype.OptionalNamedType('parameters', univ.ObjectIdentifier())
+        )
+
+class Extension(univ.Sequence):
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('extnID', univ.ObjectIdentifier()),
+        namedtype.DefaultedNamedType('critical', univ.Boolean('False')),
+        namedtype.NamedType('extnValue', univ.OctetString())
+        )
+
+class Extensions(univ.SequenceOf):
+    componentType = Extension()
+    sizeSpec = univ.SequenceOf.sizeSpec + constraint.ValueSizeConstraint(1, MAX)
+
+class SubjectPublicKeyInfo(univ.Sequence):
+    componentType = namedtype.NamedTypes(
+         namedtype.NamedType('algorithm', AlgorithmIdentifier()),
+         namedtype.NamedType('subjectPublicKey', univ.BitString())
+         )
+
+class UniqueIdentifier(univ.BitString): pass
+
+class Time(univ.Choice):
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('utcTime', useful.UTCTime()),
+        namedtype.NamedType('generalTime', useful.GeneralizedTime())
+        )
+    
+class Validity(univ.Sequence):
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('notBefore', Time()),
+        namedtype.NamedType('notAfter', Time())
+        )
+
+class CertificateSerialNumber(univ.Integer): pass
+
+class Version(univ.Integer):
+    namedValues = namedval.NamedValues(
+        ('v1', 0), ('v2', 1), ('v3', 2)
+        )
+
+class TBSCertificate(univ.Sequence):
+    componentType = namedtype.NamedTypes(
+        namedtype.DefaultedNamedType('version', Version('v1', tagSet=Version.tagSet.tagExplicitly(tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 0)))),
+        namedtype.NamedType('serialNumber', CertificateSerialNumber()),
+        namedtype.NamedType('signature', AlgorithmIdentifier()),
+        namedtype.NamedType('issuer', Name()),
+        namedtype.NamedType('validity', Validity()),
+        namedtype.NamedType('subject', Name()),
+        namedtype.NamedType('subjectPublicKeyInfo', SubjectPublicKeyInfo()),
+        namedtype.OptionalNamedType('issuerUniqueID', UniqueIdentifier().subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 1))),
+        namedtype.OptionalNamedType('subjectUniqueID', UniqueIdentifier().subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 2))),
+        namedtype.OptionalNamedType('extensions', Extensions().subtype(explicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 3)))
+        )
+
+class X509Certificate(univ.Sequence):
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('tbsCertificate', TBSCertificate()),
+        namedtype.NamedType('signatureAlgorithm', AlgorithmIdentifier()),
+        namedtype.NamedType('signatureValue', univ.BitString())
+        )
+    
+class RSAPublicKey(univ.Sequence):
+    """
+    @summary: asn1 public rsa key
+    @see: https://tools.ietf.org/html/rfc3447
+    """
+    componentType = namedtype.NamedTypes(
+        namedtype.NamedType('modulus', univ.Integer()),
+        namedtype.NamedType('publicExponent', univ.Integer()),
+        )
+
+def load(stream):
+    """
+    @summary: load X509 certificate
+    @param stream: {str}
+    """
+    return decoder.decode(stream, asn1Spec=X509Certificate())[0]   
+
+def extractRSAKey(certificate):
+    """
+    @summary: try to extract rsa key
+    @return: (modulus, public exponent)
+    """
+    #http://www.alvestrand.no/objectid/1.2.840.113549.1.1.1.html
+    #if certificate.getComponentByName('tbsCertificate').getComponentByName('subjectPublicKeyInfo').getComponentByName('algorithm').getComponentByName('algorithm')._value != (1, 2, 840, 113549, 1, 1, 1):
+    #    raise InvalidExpectedDataException("Certificate doesn't contain RSA public key")
+    
+    rsaKey = decoder.decode(encoder.encode(certificate.getComponentByName('tbsCertificate').getComponentByName('subjectPublicKeyInfo').getComponentByName('subjectPublicKey'))[3:], asn1Spec=RSAPublicKey())[0]
+    return rsaKey.getComponentByName('modulus')._value , rsaKey.getComponentByName('publicExponent')._value
+    
+    
+    
\ No newline at end of file
diff --git a/rdpy/protocol/rdp/ber.py b/rdpy/protocol/rdp/ber.py
index 71f0c15..f416675 100644
--- a/rdpy/protocol/rdp/ber.py
+++ b/rdpy/protocol/rdp/ber.py
@@ -50,7 +50,7 @@ class Tag(object):
 
 def berPC(pc):
     """
-    Return BER_CONSTRUCT if true
+    @summary: Return BER_CONSTRUCT if true
     BER_PRIMITIVE if false
     @param pc: boolean
     @return: BerPc value
@@ -62,7 +62,7 @@ def berPC(pc):
     
 def readLength(s):
     """
-    Read length of BER structure
+    @summary: Read length of BER structure
     length be on 1 2 or 3 bytes
     @param s: stream
     @return: int or Python long
@@ -86,7 +86,7 @@ def readLength(s):
 
 def writeLength(size):
     """
-    Return structure length as expected in BER specification
+    @summary: Return structure length as expected in BER specification
     @param size: int or python long
     @return: UInt8 or (UInt8(0x82), UInt16Be)
     """
@@ -97,7 +97,7 @@ def writeLength(size):
     
 def readUniversalTag(s, tag, pc):
     """
-    Read tag of BER packet
+    @summary: Read tag of BER packet
     @param tag: Tag class attributes
     @param pc: boolean
     @return: true if tag is correctly read
@@ -108,7 +108,7 @@ def readUniversalTag(s, tag, pc):
 
 def writeUniversalTag(tag, pc):
     """
-    Return universal tag byte
+    @summary: Return universal tag byte
     @param tag: tag class attributes
     @param pc: boolean
     @return: UInt8 
@@ -117,7 +117,7 @@ def writeUniversalTag(tag, pc):
 
 def readApplicationTag(s, tag):
     """
-    Read application tag
+    @summary: Read application tag
     @param s: stream
     @param tag: tag class attributes
     @return: length of application packet
@@ -138,7 +138,7 @@ def readApplicationTag(s, tag):
 
 def writeApplicationTag(tag, size):
     """
-    Return structure that represent BER application tag
+    @summary: Return structure that represent BER application tag
     @param tag: int python that match an uint8(0xff)
     @param size: size to rest of packet  
     """
@@ -149,7 +149,7 @@ def writeApplicationTag(tag, size):
     
 def readBoolean(s):
     """
-    Return boolean
+    @summary: Return boolean
     @param s: stream
     @return: boolean
     """
@@ -164,7 +164,7 @@ def readBoolean(s):
 
 def writeBoolean(b):
     """
-    Return structure that represent boolean in BER specification
+    @summary: Return structure that represent boolean in BER specification
     @param b: boolean
     @return: BER boolean block
     """
@@ -175,7 +175,7 @@ def writeBoolean(b):
 
 def readInteger(s):
     """
-    Read integer structure from stream
+    @summary: Read integer structure from stream
     @param s: stream
     @return: int or long python
     """
@@ -207,7 +207,7 @@ def readInteger(s):
     
 def writeInteger(value):
     """
-    Write integer value
+    @summary: Write integer value
     @param param: INT or Python long
     @return: BER integer block 
     """
@@ -220,7 +220,7 @@ def writeInteger(value):
 
 def readOctetString(s):
     """
-    Read BER string structure
+    @summary: Read BER string structure
     @param s: stream
     @return: string python
     """
@@ -231,7 +231,7 @@ def readOctetString(s):
 
 def writeOctetstring(value):
     """
-    Write string in BER representation
+    @summary: Write string in BER representation
     @param value: string
     @return: BER octet string block 
     """
@@ -239,7 +239,7 @@ def writeOctetstring(value):
 
 def readEnumerated(s):
     """
-    Read enumerated structure
+    @summary: Read enumerated structure
     @param s: Stream
     @return: int or long
     """
@@ -253,7 +253,7 @@ def readEnumerated(s):
 
 def writeEnumerated(enumerated):
     """
-    Write enumerated structure
+    @summary: Write enumerated structure
     @param s: Stream
     @return: BER enumerated block 
     """
diff --git a/rdpy/protocol/rdp/gcc.py b/rdpy/protocol/rdp/gcc.py
index 96cf508..ee9ad50 100644
--- a/rdpy/protocol/rdp/gcc.py
+++ b/rdpy/protocol/rdp/gcc.py
@@ -299,7 +299,7 @@ class ServerCertificate(CompositeType):
     @summary: Server certificate structure
     @see: http://msdn.microsoft.com/en-us/library/cc240521.aspx
     """
-    def __init__(self, readLen, conditional):
+    def __init__(self, readLen = None, conditional = lambda:True):
         CompositeType.__init__(self, readLen = readLen, conditional = conditional)
         self.dwVersion = UInt32Le()
         
@@ -307,10 +307,10 @@ class ServerCertificate(CompositeType):
             """
             Closure for capability factory
             """
-            for c in [ProprietaryServerCertificate]:
+            for c in [ProprietaryServerCertificate, X509CertificateChain]:
                 if self.dwVersion.value & 0x7fffffff == c._TYPE_:
                     return c()
-            raise InvalidExpectedDataException("unknown certificate type : %s (RDPY doesn't support x.509 format please repport a bug)"%hex(self.dwVersion.value))
+            raise InvalidExpectedDataException("unknown certificate type : %s "%hex(self.dwVersion.value))
             
         self.certData = FactoryType(CertificateFactory)
         
@@ -331,6 +331,29 @@ class ProprietaryServerCertificate(CompositeType):
         self.wSignatureBlobType = UInt16Le(0x0008, constant = True)
         self.wSignatureBlobLen = UInt16Le(lambda:sizeof(self.SignatureBlob))
         self.SignatureBlob = String(readLen = self.wSignatureBlobLen)
+
+class CertBlob(CompositeType):
+    """
+    @summary: certificate blob, contain x509 data
+    @see: http://msdn.microsoft.com/en-us/library/cc241911.aspx
+    """
+    def __init__(self):
+        CompositeType.__init__(self)
+        self.cbCert = UInt32Le(lambda:sizeof(self.abCert))
+        self.abCert = String(readLen = self.cbCert)
+
+class X509CertificateChain(CompositeType):
+    """
+    @summary: X509 certificate chain
+    @see: http://msdn.microsoft.com/en-us/library/cc241910.aspx
+    """
+    _TYPE_ = CertificateType.CERT_CHAIN_VERSION_2
+    
+    def __init__(self):
+        CompositeType.__init__(self)
+        self.NumCertBlobs = UInt32Le()
+        self.CertBlobArray = ArrayType(CertBlob, readLen = self.NumCertBlobs)
+        self.padding = String(readLen = UInt8(lambda:(8 + 4 * self.NumCertBlobs.value)))
         
 class RSAPublicKey(CompositeType):
     """
diff --git a/rdpy/protocol/rdp/lic.py b/rdpy/protocol/rdp/lic.py
index 20cd47c..b7c4aa1 100644
--- a/rdpy/protocol/rdp/lic.py
+++ b/rdpy/protocol/rdp/lic.py
@@ -25,7 +25,8 @@
 from rdpy.core.type import CompositeType, UInt8, UInt16Le, UInt32Le, String, sizeof, FactoryType, ArrayType, Stream
 from rdpy.core.error import InvalidExpectedDataException
 import rdpy.core.log as log
-import rc4, sec
+import rc4, sec, gcc
+from rdpy.core import x509
 
 class MessageType(object):
     """
diff --git a/rdpy/protocol/rdp/mcs.py b/rdpy/protocol/rdp/mcs.py
index b14891f..1f6d908 100644
--- a/rdpy/protocol/rdp/mcs.py
+++ b/rdpy/protocol/rdp/mcs.py
@@ -306,7 +306,7 @@ class Client(MCSLayer):
         
         #static virtual channel
         if self._nbChannelRequested < self._serverSettings.getBlock(gcc.MessageType.SC_NET).channelCount.value:
-            channelId = self._serverSettings.getBlock(gcc.MessageType.SC_NET).channelIdArray._array[self._nbChannelRequested]
+            channelId = self._serverSettings.getBlock(gcc.MessageType.SC_NET).channelIdArray[self._nbChannelRequested]
             self._nbChannelRequested += 1
             self.sendChannelJoinRequest(channelId)
             return
@@ -384,7 +384,7 @@ class Client(MCSLayer):
         if confirm == 0:
             serverNet = self._serverSettings.getBlock(gcc.MessageType.SC_NET)
             for i in range(0, serverNet.channelCount.value):
-                if channelId == serverNet.channelIdArray._array[i].value:
+                if channelId == serverNet.channelIdArray[i].value:
                     self._channels[channelId] = self._virtualChannels[i][1] 
         
         self.connectNextChannel()
diff --git a/rdpy/protocol/rdp/sec.py b/rdpy/protocol/rdp/sec.py
index 4c6a4fb..de426e5 100644
--- a/rdpy/protocol/rdp/sec.py
+++ b/rdpy/protocol/rdp/sec.py
@@ -26,7 +26,7 @@ import gcc, lic, tpkt
 from rdpy.core.type import CompositeType, Stream, UInt32Le, UInt16Le, String, sizeof, UInt8
 from rdpy.core.layer import LayerAutomata, IStreamSender
 from rdpy.core.error import InvalidExpectedDataException
-from rdpy.core import log
+from rdpy.core import log, x509
 
 class SecurityFlag(object):
     """
@@ -155,6 +155,9 @@ def sessionKeyBlob(secret, random1, random2):
 def macData(macSaltKey, data):
     """
     @see: http://msdn.microsoft.com/en-us/library/cc241995.aspx
+    @param macSaltKey: {str} mac key
+    @param data: {str} data to sign
+    @return: {str} signature
     """
     sha1Digest = sha.new()
     md5Digest = md5.new()
@@ -179,6 +182,9 @@ def macData(macSaltKey, data):
 def tempKey(initialKey, currentKey):
     """
     @see: http://msdn.microsoft.com/en-us/library/cc240792.aspx
+    @param initialKey: {str} key computed first time
+    @param currentKey: {str} key actually used
+    @return: {str} temp key
     """
     sha1Digest = sha.new()
     md5Digest = md5.new()
@@ -514,9 +520,17 @@ class Client(SecLayer):
             self._encryptRc4 = rc4.RC4Key(self._currentEncryptKey)
             
             #send client random encrypted with
-            certificate = self._transport.getGCCServerSettings().SC_SECURITY.serverCertificate.certData
+            certificate = self._transport.getGCCServerSettings().SC_SECURITY.serverCertificate.certData._value
+            if isinstance(certificate, gcc.ProprietaryServerCertificate):
+                modulus = bin2bn(certificate.PublicKeyBlob.modulus.value[::-1])
+                publicExponent = certificate.PublicKeyBlob.pubExp.value
+            elif isinstance(certificate, gcc.X509CertificateChain):
+                modulus, publicExponent = x509.extractRSAKey(x509.load(certificate.CertBlobArray[-1].abCert.value))
+            else:
+                raise InvalidExpectedDataException("unknown certificate type")
+            
             #reverse because bignum in little endian
-            serverPublicKey = rsa.PublicKey(bin2bn(certificate.PublicKeyBlob.modulus.value[::-1]), certificate.PublicKeyBlob.pubExp.value)
+            serverPublicKey = rsa.PublicKey(modulus, publicExponent)
             
             message = ClientSecurityExchangePDU()
             #reverse because bignum in little endian
diff --git a/rdpy/protocol/rdp/x224.py b/rdpy/protocol/rdp/x224.py
index 89cbbc9..d52562f 100644
--- a/rdpy/protocol/rdp/x224.py
+++ b/rdpy/protocol/rdp/x224.py
@@ -132,7 +132,7 @@ class X224Layer(LayerAutomata, IStreamSender):
         LayerAutomata.__init__(self, presentation)
         #default selectedProtocol is SSl
         #client requested selectedProtocol
-        self._requestedProtocol = Protocols.PROTOCOL_RDP
+        self._requestedProtocol = Protocols.PROTOCOL_RDP 
         #server selected selectedProtocol
         self._selectedProtocol = Protocols.PROTOCOL_SSL