Multi-party computation based on physical coins

Yuichi Komano, Takaaki Mizuki

研究成果: Conference contribution


In the history of cryptography, many cryptographic protocols rely on random coin tosses to discuss their provable security. Although flipping coins is indispensable in this manner, the coins themselves have never been in the spotlight. Therefore, we would like to make physical coins go up to the stage of cryptography, as a deck of physical playing cards has been used to perform a secure multi-party computation. Such a card-based protocol is helpful both to perform a secure computation without any black-box computers and to understand the principles of secure protocols. In this paper, we propose a new framework of secure multi-party computation using physical coins, named a coin-based protocol. Whereas a face-down card can conceal the information about its face side, one side of a coin leaks the information of its other side. Hence, more careful design is required for a secure coin-based protocol than the card-based one. We introduce a computational model of the coin-based protocol and explicitly give protocols for NOT, AND, and copy computations. We also discuss how to implement the protocols in practice.

ホスト出版物のタイトルTheory and Practice of Natural Computing - 7th International Conference, TPNC 2018, Proceedings
編集者Carlos Martín-Vide, Miguel A. Vega-Rodríguez, David Fagan, Michael O’Neill
出版社Springer Verlag
出版ステータスPublished - 2018
イベント7th International Conference on the Theory and Practice of Natural Computing, TPNC 2018 - Dublin, Ireland
継続期間: 2018 12 122018 12 14


名前Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
11324 LNCS


Other7th International Conference on the Theory and Practice of Natural Computing, TPNC 2018

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)

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