Santin, Costa and Maziero have proposed a new model for secure e-voting implementation. This article have been cited by many others and it is published on IEEE Security & Privacy. Their method guarantees confidentiality, integrity, availability, authenticity and anonimity. It also prevents coercions. Following diagram shows how the system is implemented.
Santin, A. O., Costa, R. G., & Maziero, C. A. (2008). A Three-Ballot-Based Secure Electronic Voting System. IEEE Security & Privacy Magazine, 6(3), 14-21. doi:10.1109/msp.2008.56