Calendário

Março 2024
SeTeQuQuSeDo
  
 1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31

O Grupo

A Universidade

Visitantes

Responsabilidade Social

Pesquisa


Gerenciamento de chaves públicas sobrevivente baseado em grupos para MANETs

The characteristics of mobile ad hoc networks, as the dynamic environment and the lack of infrastructure, make it difficult the implementation of effective key management systems. Among the proposed systems, the Self-Organized Public Key Management System for MANETs (PGP-Like) has been well considered, as it is totally distributed, self- organized, and does not rely on any certificate authority. Firstly, this work quantifies the impacts of lack of cooperation and Sybil attacks on PGP-Like. Results show that PGP-Like mantains its effectiveness even in face of 40% of selfish nodes, but it is fully vulnerable to Sybil attacks. Thus, the Survivable Group-based Public Key Management for MANETs (SG-PKM) is presented. It is designed to be more resistant to Sybil attacks than PGP-Like. In SG-PKM, nodes form groups based on users relationship, and issue certificates for each other. SG-PKM also stablishes that groups can issue certificates to other groups. Any two nodes, that do not have a direct connection between them, are able to authenticate themselves through certificate chains binding their groups. Moreover, the scheme requires at least two disjoint certificate chains for authentication, increasing the resistance to Sybil attacks. Results show that SG-PKM mantains its effectiveness in face of lack of cooperation attacks, even under 40% of selfish nodes, similarly to PGP-Like. More important, SG-PKM mitigates the impact of Sybil attacks, supporting the non-compromissing authentication rate above than 70% for groups with five or six members, even in presence of 40% of malicious nodes.