title: NotImplementedError: Use module Crypto.Signature.pkcs1_15 instead
body: <p>I am using fabric library for creating a remote connection and copying my files. The code is fine, I have rechecked it several times. But I am getting "NotImplementedError: Use module Crypto.Signature.pkcs1_15 instead" while running the code. I don't even understand the error. For convenience, I am adding the trace of this error.</p>
  
  <pre><code>`ubuntu@ubuntu-VirtualBox:~/Downloads/finalinstallandconn$ python Installation_Manager.py 
  connection env is setup
  [ubuntu@localhost:22] sudo: mkdir -p /opt/saas/
  Traceback (most recent call last):
    File "Installation_Manager.py", line 43, in &lt;module&gt;
      install.install()
    File "Installation_Manager.py", line 34, in install
      self.pre_conditions()
    File "Installation_Manager.py", line 25, in pre_conditions
      self.conn.copy_directory(self.path, "/opt/saas/")
    File "/home/ubuntu/Downloads/finalinstallandconn/connections.py", line 34, in copy_directory
      self.run_remote_command('mkdir -p '+remote_path)
    File "/home/ubuntu/Downloads/finalinstallandconn/connections.py", line 24, in run_remote_command
      sudo(command)
    File "/usr/local/lib/python2.7/dist-packages/fabric/network.py", line 649, in host_prompting_wrapper
      return func(*args, **kwargs)
    File "/usr/local/l`enter code here`ib/python2.7/dist-packages/fabric/operations.py", line 1109, in sudo
      stderr=stderr, timeout=timeout, shell_escape=shell_escape,
    File "/usr/local/lib/python2.7/dist-packages/fabric/operations.py", line 923, in _run_command
      channel=default_channel(), command=wrapped_command, pty=pty,
    File "/usr/local/lib/python2.7/dist-packages/fabric/state.py", line 397, in default_channel
      chan = _open_session()
    File "/usr/local/lib/python2.7/dist-packages/fabric/state.py", line 389, in _open_session
      return connections[env.host_string].get_transport().open_session()
    File "/usr/local/lib/python2.7/dist-packages/fabric/network.py", line 159, in __getitem__
      self.connect(key)
    File "/usr/local/lib/python2.7/dist-packages/fabric/network.py", line 151, in connect
      user, host, port, cache=self, seek_gateway=seek_gateway)
    File "/usr/local/lib/python2.7/dist-packages/fabric/network.py", line 452, in connect
      sock=sock
    File "/usr/local/lib/python2.7/dist-packages/paramiko/client.py", line 325, in connect
      t.start_client()
    File "/usr/local/lib/python2.7/dist-packages/paramiko/transport.py", line 492, in start_client
      raise e
  NotImplementedError: Use module Crypto.Signature.pkcs1_15 instead`
  </code></pre>