title: SSH authentication process
body: <p>I use SSH to connect to a Linux server from my Windows OS computer. After I created another Windows user account in my local computer and I used SSH from the new account I found that it also reverts the</p>
  <blockquote>
  <p>The authenticify of host '...' can't be established ... ECDSA key fingerprint is ...</p>
  </blockquote>
  <p>message which I understand should appear only once when it is the first time connecting to the server.</p>
  <p>I am a beginner about SSH and my questions are:</p>
  <ol>
  <li><p>What is an ECDSA key fingerprint?Is it the public key or the private key?</p>
  </li>
  <li><p>When I used my old Windows account to connect to the server by SSH, it does not give the message. Could I have a brieft outline of the phases of SSH authentication(and/or encryption) because I don't know what would affect the key generation. I just thought connecting from the same client(as I am using the same computer) would not prompt the warning message again.</p>
  </li>
  <li><p>Do I understand the concept of client correctly? Is it not just about the machine (e.g. IP) but also other things like Windows account, ... etc? would be good to know what constitutes a client completely.</p>
  </li>
  </ol>