Security Comparison of Blockchain and Cloud-based Identity Management: Considering the Scalability Problem

Identity management (IdM) is used in every facet of our electronic society. The need for IdM and the problems these systems face grow as our electronic identities grow and become more complex. When IdMS is concerned with identifying and controlling the individual and access controls in the system, IdMS faces a new level of complexity as the number of users increases, making these systems vulnerable to various threats and attacks. However, while the concepts of attacker and target are well established in the field of information security, when it comes to privacy, these two concepts can be very limited. Personal information can be used for various purposes, and it is not always the scenario that the privacy threat comes from what is considered an attacker from the beginning. Here comes the Cloud and Blockchain 's role in providing more secure and scalable IdMS. This study aims to cover existing solutions by describing their level of security through the risk assessment process to provide a concise picture of the differences.