No abstract

In the Smart Grids context, all communications must be handled in a secure way, including multicast traffic. The Application Layer Multicast (ALM) algorithms provide better flexibility and can employ security mechanisms, however, causes overhead to all nodes to build the multicast tree. In this work is proposed another approach to provide a secure multicast focusing on filtering packets on nodes without need an overlay protocol. It uses the multihop property of Wireless Mesh Networks (WMN) usually employed to bring connectivity to smart meters. Also, there is the support to message authentication code (MAC) using symmetric cryptography and presents an algorithm to provide a secure key distribution system. The results show that this approach is lightweight, secure, and assures multicast message delivery, even on failures caused by attacks on the key distribution system. The key management protocol used to provide authentication and integrity are evaluated using an automated test tool.

The implementation of a Smart Grid demands a network of two-way communication for interaction between the several devices in the system and the management systems. However, communication between the active devices in the system is a big challenge. In addition to providing communication between a large numbers of devices, it is necessary ensure the security on transmitted information. In this context, the use of mesh networks is an interesting alternative. The main feature of this type of network is the auto configuration of the topology and the high dynamic on active devices. The routing infrastructure is implemented by these devices, through exchange of routing tables between the nodes. Thus, it is necessary prevent unauthorized devices disclose routes or may transmit any data on the network. In this context, the authenticity and the integrity information's can be compromised by a false node. Among the protective measures that can be applied in this case highlights the use of authentication mechanism in each node. In these terms, this work presents a proposal to ensure the authenticity of the participating nodes of a mesh network, through signing the control messages of OLSR protocol via SECOM middleware.

A necessidade de realização de pesquisas de computação em larga escala vem estimulando a criação de redes de experimentação. Ao mesmo tempo, a virtualização de recursos computacionais através das clouds vem se demonstrando uma ferramenta muito atraente para as instituições, por prover economia, bom desempenho e melhor disponibilidade dos serviços. Contudo, o acesso a ambas as tecnologias ainda não é bem difundido nas instituições públicas de ensino. Assim, este trabalho propõe uma arquitetura de computação que integra cloud computing e testbeds dentro das universidades, a Campus Test Cloud.

No abstract