Followup: I suspected that this problem should have been studied in the academic literature. Indeed it is, and this seems to be a good starting point to read ab

Followup: I suspected that this problem should have been studied in the academic literature. Indeed it is, and this seems to be a good starting point to read about it, if anyone is interested: Sabotage-tolerance and trust management in desktop grid computing http://estudogeral.sib.uc.pt/jspui/bitstream/10316/4095/1/file608a385c50234adaa56526c950cb8332.pdf http://estudogeral.sib.uc.pt/jspui/bitstream/10316/4095/1/fi...