This white paper describes why and how any organization can implement secure Internet single sign-on, which provides for the portability and interoperability of identity information across organizational boundaries. Employees today may need to access up to thirty different applications within the enterprise network and over the Internet in the performance of their daily jobs. Most businesses are struggling to secure their internal networked resources while still providing access to external applications, including Software as a Service (SaaS) and other business process outsourcing (BPO) arrangements. Fortunately, there are now standards-based solutions available that provide solid security in a multi-party environment.