21. The computer of claim 20 , wherein the program further includes instructions for, subsequent to the removing, modifying the reputation function to distribute the respective current iteration value corresponding to each removed node among a remaining set of reputation values.
21. The computer of claim 20 , wherein the program further includes instructions for, subsequent to the removing, modifying the reputation function to distribute the respective current iteration value corresponding to each removed node among a remaining set of reputation values. 22. The computer of claim 21 , wherein the program further includes instructions for: identifying a set of nodes removed because their respective current iteration reputation values were less than zero; and modifying each respective current iteration reputation value in the set based on a decay factor of the reputation ranking function and an iteration value during which the respect node in the set was removed.