Blockchain-Based Secure Data Transmission for IoT Devices

Abstract: The rapid growth of the Internet of Things (IoT) has led to the widespread adoption of smart devices in surveillance, security, and monitoring applications. However, IoT devices are vulnerable to security threats such as unauthorized access, data tampering, cyber-attacks, and centralized storage failures. This project proposes a Blockchain- Based Secure Data Transmission for IoT Devices to enhance the security, integrity, and reliability of data communication. The system utilizes ESP32-CAM and sensors to detect events and capture surveillance data, which is transmitted securely through a network. AES encryption is used to ensure data confidentiality, while SHA-256 hashing is applied to maintain data integrity. The generated hash values are stored on a blockchain network, providing tamper-proof verification and transparency. The actual data is stored securely in cloud and local storage for backup and accessibility. The proposed system also supports real-time monitoring and alert notifications. By integrating IoT, blockchain technology, encryption, and hashing mechanisms, the system provides a secure, reliable, and scalable framework for protecting sensitive data and ensuring trustworthy communication in IoT environments.

Keywords: Internet of Things (IoT), Blockchain Technology, Secure Data Transmission, ESP32-CAM, AES Encryption, SHA-256 Hashing, Surveillance System, Data Integrity, Cloud Storage, Cybersecurity.