My approach to achieve what you describe: https://roamingaroundatrandom.wordpress.com/2014/06/16/an-mpc-based-privacy-preserving-flexible-cryptographic-voting-

My approach to achieve what you describe: https://roamingaroundatrandom.wordpress.com/2014/06/16/an-mpc-based-privacy-preserving-flexible-cryptographic-voting-scheme/ https://roamingaroundatrandom.wordpress.com/2014/06/16/an-mp... It is based on multiparty computation, and individual smartcards for the voters (the simplest secure solution).