Coercion-Resistant Electronic Elections with Observer

We introduce an electronic election scheme, that is coercion-resistant, a notion introduced by Juels et al. in [JCJ05]. In our scheme we encrypt the credentials that serve as an authorisation to vote during registration. By using a MIX-cascade we can omit one time-consuming plaintext equivalence test in the tallying. In addition, the observer facilitates registration and voting for the benefit of the voter. Pseudonymisation of the ciphertexts during the voting period implies a permanent secrecy of the submitted votes.