Advances in Cryptology – ASIACRYPT 2009

Volume 5912 of the series Lecture Notes in Computer Science pp 52-69

Quantum-Secure Coin-Flipping and Applications

  • Ivan DamgårdAffiliated withDAIMI, Aarhus University
  • , Carolin LunemannAffiliated withDAIMI, Aarhus University


In this paper, we prove classical coin-flipping secure in the presence of quantum adversaries. The proof uses a recent result of Watrous [20] that allows quantum rewinding for protocols of a certain form. We then discuss two applications. First, the combination of coin-flipping with any non-interactive zero-knowledge protocol leads to an easy transformation from non-interactive zero-knowledge to interactive quantum zero-knowledge. Second, we discuss how our protocol can be applied to a recently proposed method for improving the security of quantum protocols [4], resulting in an implementation without set-up assumptions. Finally, we sketch how to achieve efficient simulation for an extended construction in the common-reference-string model.


quantum cryptography coin-flipping common reference string quantum zero-knowledge