A Secure Blockchain-Based Communication System with Multimedia Encryption and Real-Time Consensus Visualization

Safe communication is of essence in this digital age, particularly with the explosive increase in multimedia information. In this paper, the design and implementation of Secure Blockchain-Based Communication System that uses Fernet encryption on multimedia data (text, images, audio, and video) and blockchain technology to perform decentralized logging and real-time verification is presented. The suggested system will combine symmetric encryption and a tailor-made blockchain platform to provide confidentiality, integrity, and authenticity of the data transmitted. Every message is then encrypted with the help of a specific symmetric key and is stored on a blockchain, where Proof-of-Work (PoW) consensus ensures the data integrity. The graphical user interface (GUI) created with Python and Tkinter enables a user to communicate with the encryption and decryption modules, track real-time blockchain growth and performance indicators. The performance of the system was tested widely to prove that the system secured the multimedia data transmission and also could scale with the growth of the blockchain. The combination of blockchain delivers the impossibility of tampering with data validation, and the visualization of the real-time consensus gives a transparent insight into the inner workings of the blockchain, and the system is applicable in secure messaging with journalists, imaging in the medical field, and surveillance data.