Speaker: Mehrdad Nojoumian
University of Waterloo
Title: Secret Sharing Based on the Social Behaviors of Players
Initially, a mathematical model for "trust computation" in social networks is provided. Subsequently, the notion of a "social secret sharing scheme" is introduced in which shares are allocated based on a player's reputation and the way she interacts with other parties. In other words, this scheme renews shares at each cycle without changing the secret, and allows trusted parties to gain more authority.
Finally, a novel "socio-rational secret sharing" scheme is proposed in which rational foresighted players have long-term interactions in a social context, i.e., players run secret sharing while founding and sustaining a trust network. To motivate this, consider a repeated game such as sealed-bid auctions. If we assume each party has a reputation value, we can then penalize (or reward) players who are selfish (or unselfish) from game to game. This social reinforcement stimulates players to be cooperative.
*Keywords*: Cryptography, Game Theory, and Reputation Systems