21 - Bringing down the complexity: Fast composable protocols for card games without secret state

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  • Bernardo David, Tokyo Institute of Technology, IOHK
  • ,
  • Rafael Dowsley, IOHK
  • ,
  • Mario Larangeira, Tokyo Institute of Technology, IOHK

While many cryptographic protocols for card games have been proposed, all of them focus on card games where players have some state that must be kept secret from each other, e.g closed cards and bluffs in Poker. This scenario poses many interesting technical challenges, which are addressed with cryptographic tools that introduce significant computational and communication overheads (e.g. zero-knowledge proofs). In this paper, we consider the case of games that do not require any secret state to be maintained (e.g. Blackjack and Baccarat). Basically, in these games, cards are chosen at random and then publicly advertised, allowing for players to publicly announce their actions (before or after cards are known). We show that protocols for such games can be built from very lightweight primitives such as digital signatures and canonical random oracle commitments, yielding constructions that far outperform all known card game protocols in terms of communication, computational and round complexities. Moreover, in constructing highly efficient protocols, we introduce a new technique based on verifiable random functions for extending coin tossing, which is at the core of our constructions. Besides ensuring that the games are played correctly, our protocols support financial rewards and penalties enforcement, guaranteeing that winners receive their rewards and that cheaters get financially penalized. In order to do so, we build on blockchain-based techniques that leverage the power of stateful smart contracts to ensure fair protocol execution.

TitelInformation Security and Privacy - 23rd Australasian Conference, ACISP 2018, Proceedings
RedaktørerWilly Susilo, Guomin Yang
Antal sider19
Udgivelsesår1 jan. 2018
ISBN (trykt)9783319936376
StatusUdgivet - 1 jan. 2018
Begivenhed23rd Australasian Conference on Information Security and Privacy, ACISP 2018 - Wollongong, Australien
Varighed: 11 jul. 201813 jul. 2018


Konference23rd Australasian Conference on Information Security and Privacy, ACISP 2018
SponsorAustralian Government Department of Defence Science and Technology, Cryptography - Open Access Journal by MDPI, DATA61, et al., School of Computing and Information Technology, Springer
SerietitelLecture Notes in Computer Science

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