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Mobile phones are becoming more and more important in everyday life, evolving to be used in plenty of different situations, including at work. Several companies want to enter the market and provide competitive products to gain part of the benefits that the mobile market offers. A group of these companies, lead by Google, has developed a new operating system called Android with the objective to use it in different devices. Since mobiles are evolving and being closer to a computer, they also need more protection against attacks. Security is an important concern, specially for companies that use mobile devices to work outside the office. This master thesis focuses on the development of a Firewall for Android, the new operating system. We describe the current situation, other solutions found in the market and relevant concepts related to our work. We specify and design the application, and talk about the development and its decisions and problems. Finally, we explain the results obtained and the conclusions derived from them, and we outline future improvements that can be developed.
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