Uso da cifra de fluxo ChaCha20 em redes de automação

With the advance of the Industry 4.0, it is critical to ensure security against cyber attacks even in the field level of the industry. In this paper, we consider cyber attacks in automation networks, where an attacker eavesdrops communication channels in order to gather information about the system behavior. We propose a cryptographic scheme used in the application layer of the network which encrypt events without altering the size or structure of the transmitted data. This scheme is denoted by event-based cryptography, where an event is defined as any change in the binary vector transmitted in the network. In order to do so, we propose the use of a cryptography scheme called ChaCha20, which is known to have a high resistance to cryptanalysis.