Imunidade coletiva, um dos conceitos fundamentais associados à contaminações em redes, ocorre quando grande parte da população está imune a um ataque oriundo de uma classe de códigos maliciosos. A menor parcela de indivíduos que permanecem sem adotar contramedidas tende a estar mais protegida de ataques, por efeito da redução da contaminação epidêmica. Contudo, esta condição não leva em consideração a capacidade do atacante de estrategicamente buscar por indivíduos vulneráveis, se tornando alvos fáceis. Neste artigo, propomos um modelo analítico que nos permite capturar o impacto das contramedidas face a epidemias e atacantes estratégicos. Usando o modelo propostos, podemos verificar a existência de um equilíbrio não trivial entre o custo de uma imunização e a probabilidade de estar infectado em função do número de suscetíveis.
This work presents a new resilient, hierarchical, non-interactive and certificateless key agreement scheme. Cryptographic key agreement schemes (KAS) are used when two or more entities want to share a secret key, in order to realize secure communication using a symmetric encryption protocol. The proposed key agreement has the following characteristics: • Non-interactive: Any two nodes can compute a unique shared secret key without interaction; • Certificateless: To compute the shared secret key, each node only needs its own secret key, the identity of its peer and his public key implicitly certified; • Hierarchical: The scheme is decentralized through a hierarchy where all nodes in the hierarchy can derive the secret keys for each of its children without any limitations or prior knowledge on the number of such children or their identities; • Resilient: The scheme is resilient against compromise of any number of nodes in the hierarchy. This work is a new approach about article "Strongly-Resilient and Non-Interactive Hierarchical Key-Agreement in MANETs"which replaces id based system for certificateless system, eliminating the key escrow on all levels, increasing system security against compromised nodes. It also presents a discussion on the security of the proposed scheme and non-interactive key agreement.
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