This chapter provides an overview of the most significant security and privacy issues now facing cloud computing (CC), with a particular focus on the issue of confidentiality. Since everything is now connected due to the advancements in computing, these ideas have received extensive study in the literature. Researchers have been concentrating on different ways to implement the concepts of safety and confidentiality in order to address this issue. The most widely used method for guaranteeing the idea of secrecy is called encryption. But encryption alone does not provide more protection regarding the data in the cloud storage. Utilizing a method and a key, encryption transforms readable text into unintelligible form. Compatibility and distribution of health data systems supporting shared lookouts are planned. Authorized third-party services and health professional cards form the foundation of the solution. In addition to the DIABCARD workstations’ safe management of patient data and chip cards, encrypted communication between the two workstations and associated administrative systems has been put into place. In addition to being utilized as both a national ID and a health insurance card, the smart card chip technology will be incorporated into other cards. In addition, a number of contentious issues are thoroughly examined in order to shed light on the drawbacks of chip-based national ID cards. These issues include issues with databases, privacy invasion and anonymity, information management, insider threats, technological challenges, crime, biometrics, and issues with multipurpose cards. This study offers a comprehensive overview of significant security and privacy issues in cloud computing, with a specific focus on confidentiality. By addressing encryption methods, smart card technology, and the integration of cloud-based e-health card management systems, the study covers various aspects related to data protection and healthcare management in the cloud.