Section: New Results

Ballot stuffing in a postal voting system

In collaboration between many members of the CASSIS and CARAMEL teams, we have studied a postal voting system used by the CNRS for an election involving about 30,000 voters [16] . The structure of the material can be easily understood out of a few samples of voting material (distributed to the voters), without any prior knowledge of the system. Taking advantage of some flaws in the design of the system, we have shown how to perform major ballot stuffing, making possible to change the outcome of the election. Our attack has been tested and confirmed by the CNRS, and the system was quickly fixed for the next elections.