New Information and Communication Technologies (ICT) can greatly improve democracy, with new participation methods. Elections, which are used to directly gather citizens’ opinions, are the most widespread of those methods. Last decades, new ICT improved voting systems have been introduced which aroused new challenges in computer science. Any election to be considered as democratic is said to use a voting system that fulfills universality, equality, freedom and secrecy principles. Our research began analyzing Electronic Voting Systems that use Internet. That analysis let us to know, that nowadays Internet based Electronic Voting Systems mostly comprise equality and secrecy related properties. Hence, being universality and freedom necessary too, we performed a study of their requirements and approaches, which are shown in this document. As those universality and freedom requirements and approaches are to be considered together with equality and secrecy principles, we specified a complete Internet based Electronic Voting System. For that specification, mechanisms that while achieving equality and secrecy favor same universality and freedom levels were selected, and the corresponding changes or improvements suggested. Finally, for system validation, we analyzed the accomplishment of the security objectives introduced by the Council of Europe for Electronic Voting Systems. That analysis is complemented with the formal validation of the cryptographic telecommunication protocol, to overcome Internet usage threats. Therefore, we defined an Internet based Electronic Voting System that results as secure or risky as any other Internet service, providing universality and freedom integrated approaches that can be used in any other such voting systems.