title: Compressing and Decompressing Integer
body: <h2>Situation:-</h2>
  
  <p>I am using Python.
  I am using RSA and I am using two 64 bit keys. <strong><em>I am not an cryptographer</em></strong> . 
  I can provide you the RSA code if needed but i am not posting it as it doesn't have to do anything with the problem. I have to give the private key to a human to remember well 64bit key cannot be remembered by normal humans as far as know. </p>
  
  <h2>Problem: -</h2>
  
  <p>I want a method to compress my 64bit key to at least an integer of 10 digits and a method when those 10 digits are entered they decompress back to 64bit key.</p>
  
  Solution I have tried: -
  
  <p>Converting my 64 digit integer sequence to an string phrase or a string (the worst Idea wasted a lot of time do not try yourself).</p>
  
  <p>Using basic math operations such as 'division', 'subtraction', etc. This proved to be not a good practice as it is easily readable in the code.</p>
  
  <h1>Note</h1>
  
  <blockquote>
    <p><code>I need not to change the private key whenever programs run but whenever client wishes to.</code></p>
  </blockquote>