The blending of Cloud Computing and IoT or CloudIoT provides an efficient paradigm to connect varied medical resources and dispense efficient, reliable, agile, and intelligent healthcare services to the patients with chronic illness. With CloudIoT, healthcare systems have been augmented with ubiquitous health monitoring and critical care services. The popularity of CloudIoT‐driven healthcare applications has only surged in today's world due to minimal cost implications and pervasive feature of sensor‐based computing. Since IoT devices have constrained storage and processing power, as such are unable to provide efficient e‐health facilities and process or store humongous volume of collected medical data. Thus, integrating IoT with Cloud provides a seamless platform for bridging the gap among dissimilar objects and regulating escalating resource requirements in healthcare sector. Although CloudIoT architecture contributes toward effective patient care, yet it is challenging, given the issue of reliability and security of the patient information. The framework also lacks an established and secure healthcare architecture. The CloudIoT involves disparate networks through which sensitive medical data gets transacted. This data could be abused by malicious users and pervasive healthcare service operations could be rendered ineffective. The healthcare systems require robust security in order to avoid data tampering and privacy of user data is not compromised.

In this chapter, we survey the available CloudIoT papers and showcase overall scenario on CloudIoT‐driven healthcare services. The chapter contemplates discussion on background elements that drive CloudIoT‐health paradigm and discusses various security protocols and enabling technologies powering CloudIoT‐health platform. We also present a conceptual healthcare monitoring architecture that takes into account diverse tasks which include data analysis, communication, and computation involving cloud storage. A use case scenario is also presented that recognizes various elements that underpin and convert IoT data and transmit it to cloud. Also, we highlight design considerations for the architecture. The chapter discusses security loopholes inherent in IoT architecture and the Cloud platform. The chapter also elaborates discussion on various security countermeasures that have been proposed in literature highlighting their strengths and limitations. Also, a discussion on possible defense measures has been provided. Finally, the chapter culminates by underlining some burning research problems and security issues that need to be addressed for seamless healthcare services.