Dear Viff Development Team,
Tomas Toft and I are using ViFF to analyze Toft's secure Linear Programming protocol. At the first sight everything seemed to work nicely, but when trying to increase the number of participants and the threshold we've found an annoying fact about ViFF: The threshold should be given explicitly when creating the runtime in any ViFF program. ViFF doesn't check whether this threshold matches with the parameters given in the configuration files. Wouldn't it be nicer if the threshold is read by "create_runtime(id, players, threshold, options, Toft05Runtime)" automatically? Now doing this consistently and setting #players =3 and threshold =1 works and setting #players=5 and threshold=2 also works. However, there seems to be some bug somewhere when trying #players=5 and threshold=1. I've altered the millionaires.py such that it deals with 5 players instead of three and it provides correct output if threshold=2 but correct output for the participants 1, 2 and 3 only (and junk for players 4 and 5) if threshold=1... In addition, if I create the config-files with 5 players and threshold=1 and if I put threshold=2 in the millionaires program, it works again, i.e., provides correct output.... Hopefully, this information helps you finding the bug. If anything needs some clarification I'm happy to provide you more details... Sincerely, Sebastiaan de Hoogh (PhD student at Eindhoven University of Technology)
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