How to Explain Zero-Knowledge Protocols to Your Children. - Jean-Jacques Quisquater; Myriam Quisquater; Muriel Quisquater; Michaël Quisquater; Louis C. Guillou; Marie Annick Guillou; Gaïd Guillou; Anna Guillou; Gwenolé Guillou; Soazig Guillou; Thomas A. Berson (CRYPTO, 1989)