Robust Method for Accessing IoT Devices and Blockchain for Secure Data Management

IoT devices play an important part in the twenty-first century connection environment, allowing for remote access and control of a variety of objects. One of the most notable advantages of these internet-connected devices is their capacity to save time while granting users remote access to resources from anywhere, at any time. However, since its inception, the IoT industry has grappled with several challenges, primarily revolving around data security and privacy. Ensuring confidentiality and integrity is pivotal in establishing a robust security framework. Presently, IoT protocols offer diverse security levels, all intertwined with aspects of authentication and authorization. Despite this, there is a rising need for better security against a variety of threats, such as impounder attacks, Denial of Service (DoS) attacks, replay attacks, password guessing, masquerade attacks, and man-in-the-middle attacks. In this work, a temperature sensor (DHT22) and NodeMCU were used to examine security threats and provide a clever solution. Data was sent and received through IoT protocols at the mobile end. This study examines the secure data transfer from Internet of Things (IoT) devices to mobile devices, revealing the challenges found during prototype development and outlining solutions. In addition, the objective was to create a faultless prototype capable of easily transmitting data to the cloud.