Single Sign-On: stretching the definition

Condensed from my twitter earlier today, with reference to using the single sign-on service to log into Medicare Online Services:

So accessing Medicare through single sign-on involves user name, password, 2 (of 5) secret questions, 2 (of 5 total) separate Medicare Online secret questions, Medicare card number, Medicare card reference number, suburb and postcode. I don’t call that “single sign on”. Oh, and agreeing to Medicare Online T&Cs even if agreed to in a previous session 15 minutes ago.

On the other hand, if you’d like to impersonate me on the phone to Medicare, all the info you need is on my Medicare card and my driver’s licence.