How to Challenge and Cast Your e-Vote

An electronic voting protocol provides cast-as-intended verifiability if the voter can verify that her encrypted vote contains the voting options that she selected. There are some proposals of protocols with cast-as-intended verifiability in the literature, but all of them have drawbacks either in terms of usability or in terms of security. In this paper, we propose a new voting scheme with cast-as-intended verifiability which allows to audit the vote to be cast, while providing measures for avoiding coercion by allowing the voter to create fake proofs of the content of her vote. We provide an efficient implementation and formally analize its security properties.