Protecting user credentials from a computing device includes establishing a secure session between a computing device and an identity provider (e.g., a Web service). Parameters of the secure session are communicated to a credential service, which renegotiates or resumes the secure session to establish a new secure session between the credential service and the identity provider. User credentials are passed from the credential service to the identity provider via the new secure session, but the computing device does not have the parameters of the new secure session and thus does not have access to the passed user credentials. The credential service then renegotiates or resumes the secure session again to establish an additional secure session between the credential service and the identity provider. Parameters of the additional secure session are communicated to the computing device to allow the computing device to continue communicating securely with the identity provider.