## 2 Research Scope and Methods  
Literature reviews performed before have provided a lot of valuable information, highlighting the possibilities for future research on electronic voting, but there is still a need for a holistic and systematic review of the literature on electronic voting based on cryptographic protocols and blockchain technology from the point of view of information security since previous reviews mainly concentrated on broader aspects, such as usability and implementation challenges. This gap underscores the necessity for a focused exploration of the specific intersection of cryptographic protocols, blockchain technology, and information security in the context of electronic voting. Additionally, existing reviews have often been time-sensitive and may not encompass the latest advancements and emerging threats in the rapidly evolving landscape of secure e-voting systems. Therefore, this comprehensive review seeks to bridge these gaps, providing an up-to-date and in-depth analysis of the current state of research on electronic voting, with a keen focus on the robustness and resilience offered by cryptographic protocols and blockchain technology. The motivation behind this endeavor lies in equipping researchers and practitioners with a thorough understanding of the evolving security landscape, ultimately contributing to the advancement of secure, transparent, and trustworthy electronic voting systems in the future. In [5; 6], reviews of the literature on blockchain are given and cover several topics of information security related to blockchain, based on a systematic review of the literature. In [7], the authors conducted a systematic review of the blockchain literature from the point of view of information systems. A systematic review was carried out by a method based on the proposals of [PERSON] and [PERSON] [8] and the practices of [PERSON] [9]. The authors conducted a literature search using the principles of a consistent approach [10; 11], which ensured consistency, reproducibility, and transparency of the research results. This review, while comprehensive in its examination of the blockchain literature from the perspective of information systems, may not be directly suitable for our article due to the specific focus on information systems rather than electronic voting. The relevance of the review depends on the alignment of its research questions and objectives with our specific focus on the application of blockchain technology in electronic voting systems. Therefore, the article may not provide the targeted insights needed for our research agenda in the context of electronic voting security. The authors in [12] conducted a comprehensive evaluation of several articles on blockchain technology in information systems, providing a complete list of applications systematized on problems related to blockchain technology. To identify and analyze the existing literature and conduct methodological research on these topics, the authors used digital libraries such as IEEE Xplore, Scopus, ScienceDirect, SpringerLink, and ACM Digital Library. It is crucial to note certain limitations in their research. These limitations may include potential publication bias, as the selection of articles from specific digital libraries could inadvertently exclude relevant research published elsewhere. Additionally, the dynamic nature of blockchain technology may lead to the omission of recent advancements or emerging challenges. Given our specific focus on blockchain technology in the context of electronic voting, it is essential to consider whether the reviewed articles directly address the unique challenges and applications within the realm of secure and transparent voting systems. Further insights into the methodology's rigor, such as criteria for article inclusion and potential subjective biases in the evaluation process, would enhance the transparency and reliability of their findings in the context of our research agenda on blockchain technologies in voting systems.