title: How to implement Yahoo/Facebook like client computer specific Sing-in seal to secure clients from phishing attacks?
body: <p>We want to implement sign in seal to reduce risk of phishing attacks on client. We want client to know that he is on our site rather than some replica of our site. Some web search got us example of Yahoo Sign-in-seal feature. Can you guys guide me on implementing such a system?</p>
  
  <p>Details I would like to have suggestions on are specifically database design and whether mechanism will work with cookies or something else, and are there beter solutions for our requirement than Yahoo sign-in seal.</p>