Análise de comportamento do algoritmo criptográfico AES em sistemas embarcados

Abstract

Security in computer networks is currently an area that contains many challenges, especially with the large number of new devices and technologies that arise over time. In the context of the Internet of Things with new application possibilities, security at the time of data transmission on embedded systems has become an experience. However, the currently existing solutions are targeting the main conventional systems and not embedded systems that contain less memory and processing power, in addition to restricted energy sources. In this context, this work developed an application for exchanging messages between different embedded systems and between these same systems and a general purpose computer using a non-secure channel, providing the confidentiality of data transmitted through the AES cryptographic algorithm using two libraries: Relic and wolfSSL, designed for systems with poor resources. After the implementation of the application, analyses regarding the controls about the size of the messages, the size of the keys chosen for the algorithm, the architecture used and the chosen library were performed. According to the results obtained, it was possible to verify that the AES in both libraries is viable for small messages. However, for systems with fewer resources like Arduino the process takes considerably longer time for larger messages, where the encryption and decryption time in all communication in this case comes to 81% in wolfSSL and 84% for Relic.