Fair Secure Computation with Reputation Assumptions in the Mobile Social Networks

Box 2

The description of protocol II in the fail-stop setting.

Protocol II

(1) Step one: Both parties run functionality ShareGen to receive and ,

 where .

(2) Step two: For to , each party decides whether to exchange his shares with the other party

 using the TFT strategy. We highlight two premises.

(a) Each party satisfies assumptions (a)–(c).

(b) Meanwhile, parties do not know exactly whether his opponent is a TFTer party.

Note: The utility assumptions and the incomplete information compel cooperation before round .

(3) Outputs: Parties decide the outputs according to messages they have received.