Sxip's Fourteen Requirements
Dick Hardt and John Merrells of Sxip recently published Fourteen Design Goals for web-based identity systems. As Dick says in his blog entry, these are offered with a nod to Kim Cameron's Seven Laws. I've pulled out the 14 requirements from the doc -- see the doc for more in-depth discussion:
About Authentication (User) Blog
User Authentication solutions provide two-factor authentication, public key infrastructure (PKI) services, and risk-based authentication to protect interactions between consumers, business partners, and employees. User Authentication solutions are delivered as cloud-based solutions, enabling enterprises to add strong authentication to applications, networks, and devices without the capital cost of hardware and software associated with traditional strong authentication solutions.