title: Python PyCrypto and RSA problem
body: <p>I'e got simple RSA python script:</p>
  
  <pre><code>import Crypto.PublicKey.RSA
  import rsakey
  from Crypto.PublicKey import pubkey
  
  # Some global stuff
  impl = Crypto.PublicKey.RSA.RSAImplementation(use_fast_math = True)
  RSAObj = impl.construct(rsakey.RSAKeys)
  
  def decrypt(encrypted):
          return RSAObj.decrypt(encrypted)
  </code></pre>
  
  <p>and when I try to run it my CLI shows error:</p>
  
  <blockquote>
    <p>Traceback (most recent call last):<br>
    File "otrsa.py", line 6, in 
        impl = Crypto.PublicKey.RSA.RSAImplementation(use_fast_math
    = True) AttributeError: 'module' object has no attribute
    'RSAImplementation'</p>
  </blockquote>
  
  <p>I'm really new to Python and I don't know what it means.
  I would be thankful for any kind of help.</p>