Secure Cloud Storage with Client-Side Encryption Using a Trusted Execution Environment

With the evolution of computer systems, the amount of sensitive data to be stored as well as the number of threats on these data grow up, making the data confidentiality increasingly important to computer users. Currently, with devices always connected to the Internet, the use of cloud data storage services has become practical and common, allowing quick access to such data wherever the user is. Such practicality brings with it a concern, precisely the confidentiality of the data which is delivered to third parties for storage. In the home environment, disk encryption tools have gained special attention from users, being used on personal computers and also having native options in some smartphone operating systems. The present work uses the data sealing, feature provided by the Intel Software Guard Extensions (Intel SGX) technology, for file encryption. A virtual file system is created in which applications can store their data, keeping the security guarantees provided by the Intel SGX technology, before send the data to a storage provider. This way, even if the storage provider is compromised, the data are safe. To validate the proposal, the Cryptomator software, which is a free client-side encryption tool for cloud files, was integrated with an Intel SGX application (enclave) for data sealing. The results demonstrate that the solution is feasible, in terms of performance and security, and can be expanded and refined for practical use and integration with cloud synchronization services

Evaluation of the performance of an 802.11g Network in a Thermoelectric Plant.

No âmbito industrial, é sabido que as redes sem fio são as mais indicadas, já que possuem baixo custo de implantação, maior flexibilidade e são menos invasivas ao ambiente. Na literatura, dentre as tecnologias de rede sem fio aplicadas em ambientes industriais, pouco destaque é dado às tradicionais 802.11a/b/g, conhecidas pelo uso doméstico e chamadas WiFi (acrônimo de Wireless Fidelity). A pesquisa, ora descrita, tem como objetivo avaliar o desempenho de uma rede 802.11g em um ambiente industrial de uma usina termoelétrica (UTE). O cenário de análise foi constituído de 4 enlaces de comunicação, com o principal deles possuindo uma distância de, aproximadamente, 150 metros. Para a avaliação do desempenho da rede, foram consideradas três métricas: taxa de perda de pacotes, Taxa de Transferência e tempo de resposta. Os testes foram realizados por meio do estabelecimento de comunicação entre pontos dentro da sala de motores (primeiro enlace) e o servidor localizado na sala de administração (último enlace). Os resultados obtidos para potência do sinal foram comparados aos valores estimados por meio do modelo Log Distance Path Loss. Observou-se que o desempenho da comunicação realizada pela rede não sofreu degradação significativa, mesmo em um ambiente sujeito à interferência eletromagnética e demais características intrínsecas a uma UTE. Após a análise concluída, verificou-se a viabilidade do uso da tecnologia 802.11g para comunicação de dados em ambientes com características similares às de uma usina termoelétrica.In industry, it is known that wireless networks are the most suitable, since they have low implementation cost, greater flexibility and are less invasive to the environment. In the literature, among the wireless network technologies applied in industrial environments, little attention is given to traditional 802.11a/b/g, known by the domestic use and by the acronym WiFi (Wireless Fidelity). This work aims to evaluate the performance of an 802.11g network in an industrial environment of a thermal power plant. The scenario consists of four communication links, with the main one having a distance of approximately 150m. For the evaluation of network performance, we considered three metrics: packet loss rate, bandwidth and response time. Tests were carried out through the establishment of communication between points within the engine square (first link) and the server located in the boardroom (last link). The obtained results for the signal strength at each point were compared with the estimated values by the Log Distance Path Loss Model. It was verified that the performance of the communication performed by the network did not suffer significant degradation, even being in an environment subject to considerable electromagnetic interference. After the concluded analysis, it was found feasibility of using 802.11g technology for data communication in environments with characteristics similar to those of a thermal power plant