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See on Wikipedia : https://el.wikipedia.org/wiki/Helios E-voting (%CF%83%CF%8D%CF%83%CF%84%CE%B7%CE%BC%CE%B1 %CE%B7%CE%BB%CE%B5%CE%BA%CF%84%CF%81%CE%BF%CE%BD%CE%B9%CE%BA%CE%AE%CF%82 %CF%88%CE%B7%CF%86%CE%BF%CF%86%CE%BF%CF%81%CE%AF%CE%B1%CF%82).
Check its history https://el.everybodywiki.com/Kept on Wikipedia:Helios E-voting (%CF%83%CF%8D%CF%83%CF%84%CE%B7%CE%BC%CE%B1 %CE%B7%CE%BB%CE%B5%CE%BA%CF%84%CF%81%CE%BF%CE%BD%CE%B9%CE%BA%CE%AE%CF%82 %CF%88%CE%B7%CF%86%CE%BF%CF%86%CE%BF%CF%81%CE%AF%CE%B1%CF%82)?action=history.