title: Encrypted Key Exchange understanding
body: <p><br>I am trying to understand the <code>Encrypted Key Exchange</code> mechanism. I got a little confused with this illustration:
  <br><img src="https://i.stack.imgur.com/vHvpZ.png" alt="EKE">
  <br> And did not find a lot of useful reference out there. Can anyone please explain the mechanism of EKE and how it works? What are the two sides exchanging and why that is safe to attack such as Man-in-the-middle? that will be greatly helpful. <br>Thank you.</p>