An Identity-Based Rational Secret Sharing Scheme

Rational player´s behavior in secret sharing schemes always determined by their expect payoff. Under this scenario, rational players will simply not broadcast their shares so that traditional secret sharing schemes could not complete in a bounded running time. In this paper, we propose a new rational secret sharing scheme based on IBE decryption. In this scheme, shares are distributed by dealer encoded by a bilinear pairing in finite field. Rational players exchange their shares in finite repeat games. The mechanism of the scheme makes all the rational players have incentive to broadcast his or her share of the secret. The security analysis and complexity analysis are addressed in the end of the paper.