Avaliação de desempenho em redes tolerantes a atrasos para o trâmite seguro de mensagens táticas na Marinha do Brasil

Abstract

Delay-Tolerant Networks (DTN) are an evolution of the Mobile Adhoc Network (MANET) where DTN act in scenarios where nodes are sparsely distributed, with low density, whose connection is intermittent and where an end-to-end infrastructure is not available. Therefore, DTNs are recommended for high latency applications that can last from hours to even days. The maritime scenario has characteristics that would justify the use of DTN networks, however the concern with data security is also a relevant aspect for this type of architecture. For this reason, this work proposes to evaluate Tolerant Networks to Delays in the maritime scenario involving the ships of the Brazilian Navy along with helicopters for the forwarding of tactical messages, taking into account aspects of security in the perimeters where the contacts take place. The simulations compared the performance of the Epidemic, Spray and Wait and Direct Delivery protocols in 3 different scenarios of different sizes. The use of Discriminant Analysis as a classification technique to select the safe perimeters was a suggestion of improvement of the Epidemic protocol for blocking connections classified as being insecure. The discriminant function detected and blocked all connections classified as unsafe, however, for this reason, there was also a decrease in the average number of messages delivered.