diff --git a/doc/notebooks/tls/notebook1_x509.ipynb b/doc/notebooks/tls/notebook1_x509.ipynb
index c9f2eacef..7c89dc08a 100644
--- a/doc/notebooks/tls/notebook1_x509.ipynb
+++ b/doc/notebooks/tls/notebook1_x509.ipynb
@@ -68,7 +68,8 @@
    },
    "outputs": [],
    "source": [
-    "from scapy.all import *"
+    "from scapy.all import *\n",
+    "load_layer('tls')"
    ]
   },
   {
@@ -79,7 +80,7 @@
    },
    "outputs": [],
    "source": [
-    "keystr = open('raw_data/pki/ca_key.der', 'r').read()\n",
+    "keystr = open('raw_data/pki/ca_key.der', 'rb').read()\n",
     "print repr(keystr)\n",
     "# (btw, you can hide the output of a cell by double-clicking on the left of the output)"
    ]
@@ -106,7 +107,7 @@
    "source": [
     "v = privkey.version\n",
     "print 'The \\'version\\' stripped from any ASN.1 encoding is 0x%02x.' % v.val\n",
-    "print 'The \\'version\\' field correspond to bytes  %r.' % str(v)"
+    "print 'The \\'version\\' field corresponds to bytes  %r.' % raw(v)"
    ]
   },
   {
@@ -131,9 +132,9 @@
    "outputs": [],
    "source": [
     "print 'Original data: %r...' % keystr[:13]\n",
-    "print 'New version bytes:          %r' % str(privkey.version)\n",
-    "print 'New modulus bytes:                      %r...' % str(privkey.modulus)[:6]\n",
-    "print 'Rebuilt data:  %r...' % str(privkey)[:13]"
+    "print 'New version bytes:          %r' % raw(privkey.version)\n",
+    "print 'New modulus bytes:                      %r...' % raw(privkey.modulus)[:6]\n",
+    "print 'Rebuilt data:  %r...' % raw(privkey)[:13]"
    ]
   },
   {
@@ -155,7 +156,7 @@
    "source": [
     "# Let's reload the original key, then let's load a certificate associated with it\n",
     "privkey = RSAPrivateKey(keystr)\n",
-    "cert = X509_Cert(open('raw_data/pki/ca_cert.der', 'r').read())\n",
+    "cert = X509_Cert(open('raw_data/pki/ca_cert.der', 'rb').read())\n",
     "cert.show()"
    ]
   },
@@ -256,7 +257,7 @@
    "outputs": [],
    "source": [
     "# We can compute the RSA signature over the part of the certificate which is to be signed\n",
-    "privkey.sign(str(cert.tbsCertificate))"
+    "privkey.sign(raw(cert.tbsCertificate))"
    ]
   },
   {