2025-06-042025-06-042025-02-21DUARTE, Geovane de Lima. Simulação de ataque DDoS em redes blockchain para cibersegurança. Orientador: José Jailton Henrique Ferreira Junior. 2025. 81 f. Trabalho de Curso (Bacharelado em Engenharia de Computação) – Faculdade de Engenharia da Computação, Campus Universitário de Castanhal, Universidade Federal do Pará, Castanhal, 2025. Disponível em: https://bdm.ufpa.br/handle/prefix/8263. Acesso em:.https://bdm.ufpa.br/handle/prefix/8263This work’s main objective is to create and evaluate a Blockchain network developed with Python code- based on the bitcoin Ethereum algorithm- focusing on analyzing its efficiency and resilience in the face of overload attacks, such as DDoS attacks. The proposal is to investigate how the network behaves under adversarial conditions to improve the cybersecurity of decentralized systems, such as Blockchains. The approach developed involves building a local server to host the Blockchain network, allowing control and analysis in a controlled environment. After implementing the network, tests were carried out on equipment with an initially defined configuration, to observe how the Blockchain responds to variations in hardware and processing capacity. The DDoS attack simulation, in particular the HTTP Flood type, was conducted in different scenarios to verify the impact on network operation. The objective was to observe whether Blockchain can maintain its functionality, security and availability in the face of excessive attacks, common in DDoS attacks. Analysis of the results involved collecting statistics related to transaction pattern, data volume and service availability. With this data, it was possible to identify critical points and suggest possible mitigation strategies, such as the implementation of traffic filters and more robust consensus algorithms, which can increase the security and operational efficiency of the network in attack situations. The results found showed that the solution was effective in maintaining the stability of the Blockchain in different attack scenarios, with good efficiency in terms of data volume and service availability. This research demonstrated the potential of Blockchain networks to resist DDoS attacks, combined with appropriate mitigation strategies, contributing to a better understanding of vulnerabilities and possibilities for improving the cybersecurity of distributed systems.Acesso AbertoBlockchainAtaque DDoSCibersegurançaDDoS attackCybersecurityCNPQ::CIENCIAS EXATAS E DA TERRATrabalho de Curso - Graduação - MonografiaAttribution-NonCommercial-NoDerivs 3.0 Brazil