... followingproposition that a total effort game containing non-zero active and passive players willalways have a non-empty pessimistic core. Towards a Cooperative Defense Model Against Network Security Attacks 13Proposition ... Rangan A value is associated with each coalition, which is shared among the members of thecoalition. As against a non -cooperative game, where individual players are assigned a payoff, in a coalitional ... Game Theoryfor Networks, pages 673–682, Piscataway, NJ, USA, 2009. IEEE Press. Towards a Cooperative Defense Model Against Network Security Attacks 1717. Jens Grossklags, Benjamin Johnson, and...