Abstract: A mechanism is provided for signing on a user of a first domain into an affiliate application in a second domain. When the user needs access to the affiliate application, the request for access causes a ticket to be generated. The ticket identifies the user and is passed to an adapter. The adapter, which ultimately will perform the sign on in the affiliate application, redeems the ticket for the user's credentials (e.g., a valid userID/password combination for the affiliate application), and then presents the credentials to the affiliate application. A service is provided that issues tickets, redeems tickets, manages the registration and de-registration of affiliate applications, manages the correlation between a user and the user's credentials with an affiliate application, and manages encryption of stored records.