I was able to vote twice, is it normal?
Yes! In Belenios, you may vote as many times as you wish, until the election closes. Only the last vote is kept (and you may check its presence in the public ballot box using your tracking number).
What is the difference between Belenios and Helios?
While the implementations of Belenios and Helios are distinct, the voting protocol underlying Belenios (cf corresponding research report) builds on Helios. The main difference is the use of credentials, that prevent ballot stuffing. In Belenios, each voter receives a private credential (by email) while the election server receives only the corresponding public credential. Even if the election server is compromised, no ballot can be added!
By default, the Belenios server stores the decryption key, similarly to Helios. However, the Belenios platform also provides an easy way for the election administrator to add decryption authorities. The decryption keys are then generated locally on the computer of each decryption authority and only the public keys are transmitted to the server.
Why Belenios is named Belenios?
Please direct any enquiries about Belenios to the public mailing list.