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Auflistung nach Autor:in "Spycher, Oliver"

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  • Konferenzbeitrag
    Achieving meaningful efficiency in coercion-resistant, verifiable Internet voting
    (5th International Conference on Electronic Voting 2012 (EVOTE2012), 2012) Spycher, Oliver; Koenig, Reto; Haenni, Rolf; Schläpfer, Michael
    In traditional voting schemes with paper, pens, and ballot-boxes, appropriate procedures are put in place to reassure voters that the result of the tally is correct. Considering that in Internet voting errors or fraud will generally scale over a much greater fraction of votes, the demand to get strong reassurances as well, seems more than justified. With the ambition of offering a maximum degree of transparency, so-called verifiable schemes have been proposed. By publishing the relevant information, each voter may verify that her vote is included in the final tally and that accepted votes have been cast using proper voting material. Remarkably, this can be done while guaranteeing the secrecy of the ballot at the same time. On the negative side, high transparency will generally make it easier for voters to reveal how they voted, e.g., to a coercer. In this paper we propose an Internet voting protocol that is verifiable and simultateously makes it practically impossible for vote buyers or coercers to elicit the voters' behaviour. We compare its efficiency with existing work under equal degrees of coercion-resistance using an appropriate measure (δ). The contribution of our scheme lies in its efficiency during the most critical phases of the voting procedure, i.e., vote casting and tallying. Moreover, during these phases, efficiency is insensitive to the desired degree of coercion-resistance.
  • Konferenzbeitrag
    Coercion-resistant hybrid voting systems
    (4th International Conference on Electronic Voting 2010, 2010) Spycher, Oliver; Haenni, Rolf; Dubuis, Eric
    This paper proposes hybrid voting systems as a solution for the vote buying and voter coercion problem of electronic voting systems. The key idea is to allow voters to revoke and overrule their electronic votes at the polling station. We analyze the potential and pitfalls of such revocation procedures and give concrete recommendations on how to build a hybrid system offering coercion-resistance based on this feature. Our solution may be of interest to governments, which aim at integrating paper-based and electronic voting systems rather than replacing the former by the latter.
  • Konferenzbeitrag
    E-voting for swiss abroad: a joint project between the confederation and the cantons
    (5th International Conference on Electronic Voting 2012 (EVOTE2012), 2012) Driza-Maurer, Ardita; Spycher, Oliver; Taglioni, Geo; Weber, Anina
    The ever-increasing number of expatriates has fed the political debate on the voting rights of Swiss abroad over the last two decades. More than the right to vote itself, the effective exercise of voting rights has become a much-discussed issue. Swiss expatriates are able to vote at the federal level, which means they are invited to vote in popular votes and referendums up to four times a year and in elections every four years. They vote mainly by post and are faced with delays inherent to this method of voting and are sometimes disenfranchised as a result. Internet voting considerably accelerates the return of the ballot. Its introduction has been one of the main demands of Swiss living abroad. In parallel, the federal and cantonal authorities have planned to gradually and pragmatically adapt direct democracy instruments and voting methods to the digital environment in a prudent and long-term process. Internet voting was launched at the beginning of the 21st century and is one of the key projects of the Confederation's e-government strategy. Three Internet voting systems have been developed so far by the cantons of Zurich, Neuchâtel, and Geneva. Internet voting was first offered to Swiss expats in June 2008. For the latest federal elections on February 13, 2011, some 55,000 Swiss abroad had the possibility to vote via Internet; on the federal elections on October 23, 2011, some 22,000 Swiss abroad registered in four cantons took part in the very first Internet voting trial during a federal election. Half of Swiss cantons have now introduced Internet voting, mainly for citizens abroad. While it is too early to draw conclusions on whether Internet voting fosters participation of expatriates in Swiss political life, recent experience clearly shows that Internet voting is well accepted. The success of the Swiss model of the introduction of e- voting can be explained with the following elements: joint strategic planning (the roadmap), a good inter-cantonal cooperation with hosting solutions, and a gradual expansion, which puts security at the center of efforts.