A Review on Features’ Robustness in High Diversity Mobile Traffic Classifications

Mobile traffics are becoming more dominant due to growing usage of mobile devices and proliferation of IoT. The influx of mobile traffics introduce some new challenges in traffic classifications; namely the diversity complexity and behavioral dynamism complexity. Existing traffic classifications methods are designed for classifying standard protocols and user applications with more deterministic behaviors in small diversity. Currently, flow statistics, payload signature and heuristic traffic attributes are some of the most effective features used to discriminate traffic classes. In this paper, we investigate the correlations of these features to the less-deterministic user application traffic classes based on corresponding classification accuracy. Then, we evaluate the impact of large-scale classification on feature's robustness based on sign of diminishing accuracy. Our experimental results consolidate the needs for unsupervised feature learning to address the dynamism of mobile application behavioral traits for accurate classification on rapidly growing mobile traffics

Debates acadêmicos por videoconferência: uma solução com software livre

O objetivo deste estudo foi descrever o relato de uma experiência utilizando recursos de videoconferência com software livre para fins de defesa de mestrado em um programa de pós-graduação. A solução apresentada inclui um tablet, celular com câmera e sistema Android e os softwares freeware: Skype, DroidCam, PowerPoint OpenOffice Remote e LibreOffice Impress, além de outros recursos necessários à apresentação propriamente dita (projetor multimídia, computador, som, microfone, além de outros). O uso do software livre para a videoconferência mostrou-se uma ótima maneira de apoiar a formação de bancas de defesa à distância permitindo a integração no processo de formação de estudantes

Detection of Dynamic Network Applications

Tato práce se zabývá detekcí dynamických síťových aplikací. Popisuje některé stávající protokoly a způsoby jejich identifikace z IP toků a obsahu paketů. Představuje návrh detekčního systému, založeného na automatické tvorbě regulárních výrazů a popisuje jeho implementaci. Prezentuje vytvořené regulární výrazy pro BitTorrent a eDonkey protokol. Jejich kvalitu srovnává s řešením L7-filteru.This thesis deals with detection of dynamic network applications. It describes some of the existing protocols and methods of their identification from IP flow and packet contents. It constitues a design of a detection system based on the automatic creation of regular expressions and describes its implementation. It presents the created regular expressions for BitTorrent and eDonkey protocol. It compares their quality with the solution of L7-filter.

Malicious Traffic Detection in Local Networks with Snort

Snort is an open source Network Intrusion Detection System combining the benefits of signature, protocol and anomaly based inspection and is considered to be the most widely de- ployed IDS/IPS technology worldwide. However, Snort's deployment in a large corporate network poses different problems in terms of performance or rule selection. This paper proposes different improvements to the Snort Security Platform: the use of another library is proposed to significantly improve the amount of traffic that can be analyzed, and Snort's multithreading possibilities are explored. A new rule classification has been devised, and rulesets suited to large corporate networks are proposed. The use of Oinkmaster has been tested and documented to seamlessly update Snort's rules

Mobile unified communication

Mestrado em Engenharia de Computadores e TelemáticaCom a constante evolução tecnológica, estão frequentemente a surgir novos métodos de comunicação. Acompanhar a evolução das telecomunicações não é um processo fácil, sendo que a criação de novas aplicações e serviços leva ao consequente desaproveitamento do seu potencial, por via da falta de familiaridade do utilizador com os mesmos. A abordagem desta dissertação tem como foco explorar esta noção ao reunir os serviços mais recentes num só protótipo de aplicação móvel. As funcionalidades pretendidas para o protótipo estão dividas em três vertentes tecnológicas: realização de chamadas de voz, envio de mensagens e recolha de dados pessoais. Os protocolos SIP, XMPP, SMTP e IMAP são alguns dos quais serviram para a implementação dos serviços, utilizando interfaces de programação incorporadas no sistema operativo Android. Ao integrar estes elementos, o resultado obtido foi o de uma aplicação de telecomunicações versátil e completa. Apesar dos problemas de ergonomia encontrados, o protótipo final alcançou os objectivos pretendidos, recolhendo bons resultados nos testes de usabilidade efectuados, despertando também o interesse de alguns utilizadores pela inovação oferecida face às aplicações tradicionais que possuem apenas um serviço de comunicações.With the constant evolution of technology, new ways of communication are created everyday. Keeping current with this evolution in telecommunications isn't an easy process: the creation of new applications and services, and the associated lack of familiarity with the new technology and applications, frequently leads to a sub-optimal use. This dissertation is focused on exploring this notion by gathering the most recent communication services on a single mobile application prototype. The target functionality for this prototype is divided in three technological features: voice call service, messaging service and personal data retrieval. The protocols used are SIP, XMPP, SMTP and IMAP, making use of native or third party libraries in the Android OS. By integrating these elements, the resulting prototype was robust and versatile, allowing for a more unified user experience. Despite some ergonomic problems, the final prototype achieved the desired results in the usability tests performed and raised interest from some users due to this unified experience - something which is not present in traditional, single service, communication applications