Abstract: A human interactive proof (HIP) service is described. In response to a request from a web server, the HIP service generates a HIP challenge and an associated attestation. The web server can then embed the generated HIP challenge in a requested web page. The attestation is used to determine whether or not a user response to the HIP challenge is correct.

Abstract: Creating an account via a mobile device. A request to create an account is received from a user via a mobile device. The request is received from the mobile device according to a wireless communications protocol. In response to the received request, a confirmation message is delivered to the mobile device for rendering to the user as a challenge. A response to the rendered challenge is received from the user via the mobile device. It is determined if the received response to the rendered challenge corresponds to the delivered confirmation message. And the account is created for the user if the received response to the rendered challenge is determined to correspond to the delivered confirmation message. Other aspects of the invention are directed to computer-readable media for use with account creation via a mobile device.

Abstract: Providing services within a network of service providers sharing an authentication service and a set of business rules. A central server receives a first request from a first server to provide a first service to a user via a client without forcing the user to present credentials. In response to the received first request, the central server stores data identifying the first service on the client. The central server further receives a second request from a second server to provide a second service to the user via the client after the user presents the credentials to the second service. After receiving the second request and the presented credentials, the central server allows the user access to the second service. In response to allowing the user access to the second service, the central server further allows the user access to the first service as a result of the stored data.