> In a verifiable voting system, voter usually get a recipe that he can verify, in later time, their vote have been counted. But what stop same recipe is handed

> In a verifiable voting system, voter usually get a recipe that he can verify, in later time, their vote have been counted. But what stop same recipe is handed out twice? Different solutions exist for this problem, which is known as a "clash attack". For example, in the Floating Receipts voting scheme, those things that you call "recipes" are pre-printed on ballots and hidden under scratch strips. The scratch strip is removed at the time when the ballot is dropped into the ballot box. If the manufacturer of the ballots were to pre-print the same "recipe" on multiple ballots, it would be discovered during the verification phase, because you would in some cases have 2 different votes cast on 2 different ballots which would contain the same "recipe". So both voters look up the "recipe" online and they are supposed to discover only one vote corresponding to the "recipe".