diff --git a/source/cfdi-cert.py b/source/cfdi-cert.py
index d017542..4b7ea77 100644
--- a/source/cfdi-cert.py
+++ b/source/cfdi-cert.py
@@ -15,7 +15,6 @@ from cryptography.x509.oid import ExtensionOID
 from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.primitives.asymmetric import padding
 
-
 from conf import TOKEN
 
 
@@ -127,17 +126,13 @@ class SATCertificate(object):
         )
         return key_pem
 
-    def get_encrypt(self, password):
-        key_enc = self._key_enc
-        if password:
-            p = password.encode()
-            obj = self._get_key('')
-            key_enc = obj.private_bytes(
-                encoding=serialization.Encoding.PEM,
-                format=serialization.PrivateFormat.PKCS8,
-                encryption_algorithm=serialization.BestAvailableEncryption(p)
+    # Not work
+    def _get_p12(self):
+        obj = serialization.pkcs12.serialize_key_and_certificates('test',
+            self.key_pem, self.cer_pem, None,
+            encryption_algorithm=serialization.NoEncryption()
             )
-        return key_enc
+        return obj
 
     def sign(self, data, password=''):
         private_key = self._get_key(password)
@@ -202,6 +197,10 @@ class SATCertificate(object):
     def key_enc(self):
         return self._key_enc
 
+    @property
+    def p12(self):
+        return self._get_p12()
+
     @property
     def error(self):
         return self._error
@@ -236,7 +235,6 @@ def main(args):
         print(cert.error)
     else:
         print(cert)
-
     return