Fully Anonymous Attribute Tokens from Lattices
Anonymous authentication schemes such as group signatures and anonymous credentials are important privacy-protecting tools in electronic communications. The only currently known scheme based on assumptions that resist quantum attacks is the group signature scheme by Gordon et al. (ASIACRYPT 2010). The authors present a generalization of group signatures called anonymous attribute tokens where users are issued attribute-containing credentials that they can use to anonymously sign messages and generate tokens revealing only a subset of their attributes. They present two lattice-based constructions of this new primitive, one with and one without opening capabilities for the group manager.