US9154306B2
patent
Systems and methods are disclosed for privacy-preserving flexible user-selected anonymous and pseudonymous access at a relying party (RP), mediated by an identity provider (IdP). Anonymous access is unlinkable to any previous or future accesses of the user at the RP. Pseudonymous access allows the user to associate the access to a pseudonym previ ously registered at the RP. A pseudonym system is disclosed. The pseudonym system allows a large number of different and unlinkable pseudonyms to be generated using only a small number of secrets held by the user. The pseudonym system can generate tokens capable of including rich seman
39 claims. 137,615 characters of text.