Voting by Mail: A Markov Chain Model for Managing the Security Risks of Absentee Voting

References

• Bipartisan Policy Center (2021) The 2020 voting experience: Lessons learned and recommendations for reform. Report, Bipartisan Policy Center, Washington, DC. Accessed September 2, 2024, https://bipartisanpolicy.org/download/?file=/wp-content/uploads/2021/04/EPP-Voting-Experience_RV1.pdf.Google Scholar
• Blessing J, Gomez J, Patiño M, Nguyen T (2020) Security survey and analysis of vote-by-mail systems. Preprint, submitted May 18, https://arxiv.org/abs/2005.08427v1.Google Scholar
• Burden BC (2021) The experiences of municipal clerks and the electorate in the November 2020 General Election in Wisconsin. Expert testimony. Accessed October 17, 2023, https://thompsoncenter.wisc.edu/wp-content/uploads/sites/509/2021/09/Burden-2020-Wisconsin-Election-Report-PUBLIC.pdf.Google Scholar
• City of Milwaukee Common Council (2012) Final voting ward demographics. Accessed August 4, 2020, https://city.milwaukee.gov/ImageLibrary/Groups/ccCouncil/2012PDF/FinalVotingWardDemographics-Ju.xls.Google Scholar
• Crimmins BL, Halderman JA, Sturt B (2025) Improving the security of United States elections with robust optimization. Oper. Res. 73(1):61–85.Link, Google Scholar
• Democracy Works (2021) Ballot Scout. Accessed May 21, 2024, https://www.democracy.works/ballotscout.Google Scholar
• De Witte M (2020) Stanford scholars find no partisan advantage of mail-in, absentee voting but other challenges lie ahead. Stanford Rep. (September 3), https://news.stanford.edu/stories/2020/09/examining-effects-challenges-mail-in-voting.Google Scholar
• Gregorio V, Scala N, Dehlinger J (2024) Evaluating mail‐based security for electoral processes using attack trees. ISE Magazine 56(8):28–33.Google Scholar
• Haseltine C (2024) VBM DTMC GitHub repository. Accessed April 27, 2025, https://github.com/HaseltineC/VBM-DTMC.Google Scholar
• Haseltine C, Wang S, Albert L (2022) Dynamic cyber-physical system security planning using attack graphs. Ellis K, Ferrell W, Knapp J, eds. Proc. IISE Annual Conf. Expo 2022 (Institute of Industrial and Systems Engineers, Norcross, GA).Google Scholar
• i3logix (2024) BallotTrax. Accessed May 21, 2024, https://www.ballottrax.com/.Google Scholar
• Krebs C (2020) Testimony of Chris Krebs before the Committee on Homeland Security and Governmental Affairs, U.S. Senate, on examining irregularities in the 2020 election, December 16, Washington, DC. Accessed January 19, 2026, https://www.hsgac.senate.gov/wp-content/uploads/imo/media/doc/Testimony-Krebs-2020-12-16.pdf.Google Scholar
• Li J, Allen TT, Akah K (2013) Could simulation optimization have prevented 2012 central Florida election lines? Hill RR, ed. Proc. 2013 Winter Simulation Conf. (IEEE Press, New York), 2088–2096.Google Scholar
• McIntyre C (2020) What queuing theory says about managing polling places amid Covid-19. MIT Election Data and Science Lab, Cambridge, MA. Accessed October 6, 2020, https://electionlab.mit.edu/sites/default/files/2020-08/WhatQueueingMeansPollingPlacesCOVID19.pdf.Google Scholar
• Milwaukee County (2023) Municipalities. Accessed July 9, 2023, https://county.milwaukee.gov/EN/Municipalities.Google Scholar
• Milwaukee Elections Commission (2020) November 3, 2020 - general election. Nov. 6, 2020. Accessed June 5, 2021, https://city.milwaukee.gov/election/ElectionInformation/ElectionResults/2020/November.Google Scholar
• Milwaukee OpenData (2020) Voting wards 2020. Accessed August 6, 2020, https://data.milwaukee.gov/dataset/voting-wards/resource/01139d6b-b65a-4d63-89da-b87f3986ff0d?inner_span=True.Google Scholar
• MIT Election Data and Science Lab (2021) Voting by mail and absentee voting. Accessed March 17, 2021, https://electionlab.mit.edu/research/voting-mail-and-absentee-voting.Google Scholar
• National Conference of State Legislatures (2022a) Report voting outside the polling place: Absentee, all-mail and other voting at home options. Accessed April 19, 2023, https://www.ncsl.org/elections-and-campaigns/voting-outside-the-polling-place.Google Scholar
• National Conference of State Legislatures (2022b) Voting outside the polling place: Absentee, all-mail and other voting at home options. Accessed June 9, 2022, https://www.ncsl.org/research/elections-and-campaigns/voting-outside-the-polling-place.aspx.Google Scholar
• Office of Inspector General (2021) United States Postal Service performance of election and political mail during the November 2020 general election. Audit report, United States Postal Service, Washington, DC.Google Scholar
• Rinaldi S, Peerenboom J, Kelly T (2001) Identifying, understanding, and analyzing critical infrastructure interdependencies. IEEE Control Systems Magazine 21(6):11–25.Crossref, Google Scholar
• Saltman RG (1988) Accuracy, integrity and security in computerized vote-tallying. Comm. ACM 31(10):1184–1191.Crossref, Google Scholar
• Scala N, Bloomquist I, Mezgebe Y, Jilcha B (2021) A process map and risk assessment for mail-based voting. Ghate A, Krishnaiyer K, Paynabar K, eds. Proc. 2021 IISE Annual Conf. (Institute of Industrial and Systems Engineers, Norcross, GA).Google Scholar
• Scala NM, Goethals PL, Dehlinger J, Mezgebe Y, Jilcha B, Bloomquist I (2022) Evaluating mail-based security for electoral processes using attack trees. Risk Anal. 42(10):2327–2343.Crossref, Google Scholar
• Schmidt A, Albert LA (2022) Designing pandemic-resilient voting systems. Socio-Econom. Planning Sci. 80:101174. Crossref, Google Scholar
• Schmidt A, Albert LA (2024) The drop box location problem. IISE Trans. 56(4):424–436.Crossref, Google Scholar
• Schneier B (1999) Attack trees: Modeling security threats. Dr. Dobb’s Journal (December), https://www.schneier.com/academic/archives/1999/12/attack_trees.html.Google Scholar
• Shen J (2013) Merge times and hitting times of time-inhomogeneous Markov chains. Dissertation, Duke University, Durham, NC.Google Scholar
• Simidchieva BI, Engle SJ, Clifford M, Jones AC, Peisert S, Bishop M, Clarke LA, Osterwell LJ (2010) Modeling and analyzing faults to improve election process robustness. Proc. 2010 USENIX/ACCURATE Electronic Voting Tech. Workshop. https://escholarship.org/uc/item/0cg3b5vb#article_main.Google Scholar
• Stewart C (2021) 2020 survey of the performance of American elections. Harvard Dataverse. Accessed June 23, 2022, https://doi.org/10.7910/DVN/Y38VIQ/SXXGGV.Google Scholar
• Stewart C III (2022) Trust in elections. Daedalus 151(4):234–253.Crossref, Google Scholar
• Stewart C III, Ansolabehere S (2015) Waiting to vote. Election Law J. 14(1):47–53.Crossref, Google Scholar
• The Heritage Foundation (2025) Election fraud map. Accessed March 12, 2025, https://electionfraud.heritage.org/.Google Scholar
• U.S. Census Bureau (2019) QuickFacts Milwaukee city, Wisconsin. Accessed August 5, 2020, https://www.census.gov/quickfacts/fact/table/milwaukeecitywisconsin/PST045219.Google Scholar
• U.S. Cybersecurity and Infrastructure Security Agency (2020) Mail-in voting in 2020 infrastructure risk assessment and infographic. Accessed March 28, 2025, https://www.cisa.gov/publication/election-mail-risk.Google Scholar
• U.S. Cybersecurity and Infrastructure Security Agency (2024) 2024 U.S. federal elections: The insider threat. Report, U.S. Cybersecurity and Infrastructure Security Agency, Washington, DC. Accessed January 19, 2026, https://www.cisa.gov/publication/election-mail-risk.Google Scholar
• U.S. Election Assistance Commission (2009a) Election administration and voting survey 2024 comprehensive report. A report from the U.S. Election Assistance Commission to the 119th Congress. U.S. Election Assistance Commission, Washington, DC. Accessed December 17, 2020, https://www.eac.gov/sites/default/files/document_library/files/Election_Operations_Assessment_Threat_Trees_and_Matrices_and_Threat_Instance_Risk_Analyzer_%28TIRA%29.pdf.Google Scholar
• U.S. Election Assistance Commission (2009b) Election operations assessment; threat trees and matrices and threat instance risk analyzer. Report, U.S. Election Assistance Commission and University of South Alabama, Washington, DC. https://www.eac.gov/sites/default/files/document_library/files/Election_Operations_Assessment_Threat_Trees_and_Matrices_and_Threat_Instance_Risk_Analyzer_%28TIRA%29.pdf.Google Scholar
• Wisconsin Elections Commission (2020a) 2020 general election voting and registration statistics report, el-109f. Report, Wisconsin Elections Commission, Madison. Accessed January 18, 2024, https://elections.wi.gov/statistics-data/voting-statistics?combine=2020&field_subject_target_id=All.Google Scholar
• Wisconsin Elections Commission (2020b) Absentee ballot report - November 3, 2020 general election. Accessed June 5, 2021, https://elections.wi.gov/node/6862.Google Scholar
• Wisconsin Elections Commission (2021) November 3, 2020 election data report. White Paper, Wisconsin Elections Commission, Madison. Accessed January 17, 2024, https://elections.wi.gov/sites/default/files/legacy/2021-01/D.%2520November%25202020%2520Election%2520Data%2520Report.pdf.Google Scholar
• Yang M, Fry MJ, Kelton WD (2009) Are all voting queues created equal? Dunkin A, ed. Proc. 2009 Winter Simulation Conf. (IEEE, New York), 3140–3149.Google Scholar
• Yasinsac A, Pardue H (2010) A process for assessing voting system risk using threat trees. Conf. Inform. Systems Appl. Res. 3(13):1–7.Google Scholar