title: SID and HSID cookies : what are they uses?
body: <p>From google :</p>
  
  <blockquote>
    <p>For example, we use cookies called ‘SID’ and ‘HSID’ which contain
    digitally signed and encrypted records of a user’s Google account ID
    and most recent sign-in time. The combination of these two cookies
    allows us to block many types of attack, such as attempts to steal the
    content of forms that you complete on web pages.</p>
  </blockquote>
  
  <p>I don't really understand the last sentence . How keeping the account ID protects from attacks ? Isn't it the other way round ? Like the user should have to sign in every time for the service to be 100% secure ?</p>