title: What is an RSA host key?
body: <p>I get this message saying:</p>
  
  <blockquote>
    <p>Permanently added the RSA host key for IP address '192.30.252.130' to the list of known hosts</p>
  </blockquote>
  
  <p>What is the meaning of the RSA key and what is the concept behind known hosts?</p>