Aadhaar-Enabled Remote Voting Systems: Biometric Authentication, Blockchain Integration and Secure Digital Verification in India\'s Electoral Process: A Systematic Review

Abstract

India conducts the world\'s largest democratic exercise, enrolling more than 900 million eligible voters across profoundly diverse geographies, languages and socioeconomic conditions. Although the country\'s electoral infrastructure has evolved steadily from paper ballots to Electronic Voting Machines (EVMs) and subsequently to Voter Verified Paper Audit Trails (VVPATs), persistent structural failures remain unresolved: large-scale impersonation risk at polling booths, systematic disenfranchisement of an estimated 450 million internal migrants and overseas citizens, and accessibility barriers for persons with disabilities. Aadhaar, India\'s universal biometric identity programme with over 1.3 billion enrolments, offers a credible foundation for addressing these challenges. This paper presents a systematic review of the literature on Aadhaar-integrated remote voting, conducted according to a PRISMA-adapted framework using IEEE Xplore, ScienceDirect, Scopus and Google Scholar as primary sources (2010-2025). The review synthesises evidence on biometric authentication architectures, blockchain-based vote-ledger designs and multi-factor digital verification mechanisms, identifying their combined potential to create a secure, inclusive remote voting framework. A structured taxonomy of system components, a comparative analysis of prior implementations and a catalogue of open technical challenges are developed. Findings indicate that no single mechanism is sufficient; rather, a layered architecture integrating all three components - authenticated identity, immutable vote recording and cryptographically secured transmission - is necessary to satisfy both security and inclusivity imperatives at India\'s exceptional scale.

Introduction

India conducts the world's largest democratic exercise, serving over 900 million voters across diverse states, territories, languages, and cultures. While traditional paper-ballot elections were vulnerable to fraud, ballot stuffing, and lengthy counting processes, the introduction of Electronic Voting Machines (EVMs) significantly improved efficiency and reduced manipulation. To address concerns about transparency, Voter Verified Paper Audit Trails (VVPATs) were introduced in 2013, providing a paper-based verification mechanism. In 2024, the Supreme Court upheld the EVM-VVPAT system while recommending enhanced verification procedures.

Despite these improvements, India's electoral system remains dependent on physical polling stations, creating challenges for over 450 million internal migrants and many overseas citizens who often cannot vote from their current locations. To address these limitations, the paper explores the potential integration of Aadhaar-based biometric authentication, blockchain technology, and multi-factor digital verification as a secure and accessible remote voting framework.

The study follows a PRISMA-based systematic review methodology, examining literature from 2010–2025 across major academic databases. From an initial 1,247 records, 77 high-quality sources were selected for analysis. The review evaluates existing voting mechanisms, including paper ballots, EVMs, VVPATs, remote voting machine prototypes, Aadhaar-based authentication systems, and international digital voting models such as those used in Estonia, Switzerland, and Brazil.

The analysis identifies several limitations in current electoral systems. These include voter exclusion caused by migration, risks of impersonation and identity verification failures, cybersecurity threats such as hacking and disinformation campaigns, and infrastructure challenges related to internet connectivity and digital literacy. While Aadhaar offers a strong foundation for secure voter identification through its large-scale biometric database, issues such as biometric authentication failures among elderly and manual labor populations highlight the need for alternative verification methods.

Overall, the paper argues that combining Aadhaar authentication, blockchain-based vote recording, and multi-factor security mechanisms could enhance electoral accessibility, transparency, and integrity. However, successful implementation would require addressing cybersecurity risks, ensuring voter privacy, improving digital infrastructure, and developing inclusive systems that accommodate all voter groups.

Conclusion

India\'s electoral system has evolved from paper ballots to EVMs, VVPATs, and now toward digital remote voting. This review developed a three-layer architecture - identity, ledger and verification - demonstrating that their integration is a necessary condition for credible remote voting. No prior implementation has deployed all three layers nationally. Seven open challenges were identified. With transparent governance and sustained investment, India has the capacity to demonstrate that democratic participation need not be constrained by geography or mobility.

References

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Copyright

Copyright © 2026 Dr. P. Muthusamy, Dr. S. Vijayaragavan, P. Sathiyapriya, R. Arthi, R. Kohila. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.