Amos Fiat (born December 1, 1956 in Haifa, Israel) is an Israeli computer scientist, a professor of computer science at Tel Aviv University. He is known for his work in cryptography, online algorithms, and algorithmic game theory.Fiat earned his Ph.D. in 1987 from the Weizmann Institute of Science under the supervision of Adi Shamir.After postdoctoral studies with Richard Karp and Manuel Blum at the University of California, Berkeley, he returned to Israel, taking a faculty position at Tel Aviv University.Many of Fiat's most highly cited publications concern cryptography, including his work with Adi Shamir on digital signatures (leading to the Fiat–Shamir heuristic for turning interactive identification protocols into signature schemes).and his work with David Chaum and Moni Naor on electronic money, used as the basis for the ecash system.With Shamir and Uriel Feige in 1988, Fiat invented the Feige–Fiat–Shamir identification scheme, a method for using public-key cryptography to provide challenge-response authentication.