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This paper considers whether a network-based observer can extract information about voter selections from the length of the exchanged network data.<\/jats:p><jats:p>We conducted a detailed analysis of the Simply Voting implementation, which had randomly varying lengths of exchanged data due to dynamic page content and gzip compression. We demonstrated that we could correctly guess a voter\u2019s selection with accuracy values ranging up to 100% in some instances. Even on more complex ballots, we generally could still rule out some combinations of candidates. We conducted a coordinated disclosure with the vendor and worked with them to roll out a mitigation.<\/jats:p><jats:p>To their credit, this discovery (and therefore its fix) was made possible by their willingness to provide a <jats:italic>publicly<\/jats:italic> accessible demo, which, as we will show, remains a rarity in the industry.<\/jats:p>","DOI":"10.1007\/978-3-031-15911-4_3","type":"book-chapter","created":{"date-parts":[[2022,9,2]],"date-time":"2022-09-02T14:04:29Z","timestamp":1662127469000},"page":"36-52","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Review Your Choices: When Confirmation Pages Break Ballot Secrecy in\u00a0Online Elections"],"prefix":"10.1007","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9018-5106","authenticated-orcid":false,"given":"James","family":"Brunet","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6671-2471","authenticated-orcid":false,"given":"Athanasios Demetri","family":"Pananos","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0228-0371","authenticated-orcid":false,"given":"Aleksander","family":"Essex","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2022,9,3]]},"reference":[{"key":"3_CR1","series-title":"Lecture Notes in Computer Science","doi-asserted-by":"publisher","first-page":"67","DOI":"10.1007\/978-3-030-30625-0_5","volume-title":"Electronic Voting","author":"A Cardillo","year":"2019","unstructured":"Cardillo, A., Akinyokun, N., Essex, A.: Online voting in Ontario municipal elections: a conflict of legal principles and technology? In: Krimmer, R., et al. (eds.) E-Vote-ID 2019. LNCS, vol. 11759, pp. 67\u201382. Springer, Cham (2019). https:\/\/doi.org\/10.1007\/978-3-030-30625-0_5"},{"key":"3_CR2","series-title":"Lecture Notes in Computer Science","doi-asserted-by":"publisher","first-page":"35","DOI":"10.1007\/978-3-030-00419-4_3","volume-title":"Electronic Voting","author":"A Cardillo","year":"2018","unstructured":"Cardillo, A., Essex, A.: The threat of SSL\/TLS stripping to online voting. In: Krimmer, R., et al. (eds.) E-Vote-ID 2018. LNCS, vol. 11143, pp. 35\u201350. Springer, Cham (2018). https:\/\/doi.org\/10.1007\/978-3-030-00419-4_3"},{"key":"3_CR3","unstructured":"Clark, J., Essex, A.: Internet voting for persons with disabilities - security assessment of vendor proposals. 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