Asynchrony and collusion in the n-party BAR transfer problem

  • Authors:
  • Xavier Vilaça;Oksana Denysyuk;Luís Rodrigues

  • Affiliations:
  • INESC-ID, Instituto Superior Técnico, Universidade Técnica de Lisboa, Portugal;INESC-ID, Instituto Superior Técnico, Universidade Técnica de Lisboa, Portugal;INESC-ID, Instituto Superior Técnico, Universidade Técnica de Lisboa, Portugal

  • Venue:
  • SIROCCO'12 Proceedings of the 19th international conference on Structural Information and Communication Complexity
  • Year:
  • 2012

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Abstract

The problem of reliably transferring data from a set of $N_{\cal P} $ producers to a set of $N_{\cal C} $ consumers in the BAR model, named N-party BAR Transfer (NBART), is an important building block for volunteer computing systems. An algorithm to solve this problem in synchronous systems, which provides a Nash equilibrium, has been presented in previous work. In this paper, we propose an NBART algorithm for asynchronous systems. Furthermore, we also address the possibility of collusion among the Rational processes. Our game theoretic analysis shows that the proposed algorithm tolerates certain degree of arbitrary collusion, while still fulfilling the NBART properties.