Redes de computadores estão sob constante ameaça, ainda mais quando conectadas à Internet. Para reduzir o risco, dispositivos de segurança como o filtro de pacotes são usados. Uma primeira camada de segurança, o filtro de pacotes é responsável pelo bloqueio do tráfego indesejado em posições chave da rede. Os pacotes que devem ser permitidos ou bloqueados pelo filtro são definidos através de um conjunto de regras programadas pelo administrador da rede. Essas regras tem duas partes: a seleção e a ação. Conforme cresce a rede e o número de serviços, a quantidade de regras tende a aumentar. Passado certo limite, a complexidade de manter uma quantidade grande de regras se torna um fardo para o administrador. Isso aumenta a probabilidade de enganos que podem prejudicar a segurança da rede. Este trabalho desenvolve o conceito de “anomalia”, cada qual representa um problema em potencial, uma contradição ou uma regra supérflua dentro do conjunto de regras; ou seja, cada anomalia alerta o administrador da rede para determinada situação. Há 7 tipos de anomalias, que podem ser divididos em dois grupos: anomalias de filtro único e anomalias em rede. As anomalias de filtro único alertam o administrador sobre regras que se contradizem (“bloqueio”) ou que não possuem efeito no filtro (“invisibilidade” e “redundância”). As anomalias em rede, por sua vez, alertam o administrador sobre filtros que se contradizem (“discordância”), filtros que bloqueiam tráfego desejado (“bloqueio”), regras que não se aplicam a nenhum pacote que passe pelo filtro onde estão (“irrelevância”) e roteadores que permitem a passagem de tráfego indesejado (“vazamento”). Cada um desses tipos de anomalia é definido formalmente e apresentado junto com um algoritmo que a encontra. As anomalias e seus algoritmos foram usados para implementar uma ferramenta, o Packet Filter Checker (PFC), que lê as regras e a descrição da topologia da rede e cria um relatório com todas as anomalias presentes. Este trabalho apresenta um caso de uso fictício que é analisado e corrigido com base nos resultados apresentados pela ferramenta. O caso de uso é apresentado em diversas iterações, cada uma representando alterações nos requisitos da rede. Este caso mostra a ferramenta e os conceitos no contexto-alvo: na ajuda ao administrador da rede. / Computer networks are under constant threat, even more when connected to the Internet. To decrease the risk of invasions and downtime, security devices such as the packet filter are deployed. As a first layer of security, the packet filter is responsible for blocking out unwanted traffic at key network locations. The packets dropped or forwarded by the filter are defined by a set of rules programmed by the network administrator. These rules are in the form of guarded commands, each with a condition and a decision section. As the number of services and networks grow, the number of rules tend to grow as well. Beyond a certain threshold, the complexity of maintaining such a large and distributed set of rules becomes a burden for the network administrator. Mistakes can be easily made, compromising security. This work develops the concept of “anomaly”, each representing a potential problem, a contradiction or a superfluous rule in the rule set; i.e. a warning to the system administrator. There are 7 types of anomalies divided in two groups: single filter anomalies and networked anomalies. The single-filter anomalies warns the administrator about rules that contradict one another (the “conflict” anomaly) or have no effect (“invisibility” and “redundancy”) in the analysed filter. The networked anomalies, on the other hand, analyse the filters in the context of the network topology and warn the administrator about filters that contradict one another (“disagreement”), filters that block desired traffic (“blocking”), rules that have no effect on the given network topology (“irrelevancy”) and routers that are enabling unwanted traffic (“leaking”). Each type of anomaly is formally defined along with its algorithm. The developed concepts were used to implement a tool — the Packet Filter Checker (PFC) — that reads a description of the rules and network topology in a simple custom language and reports all anomalies present. This tool is used to analyse and fix a fictional user case in several iterations of changing requirements. This shows the tool and the anomalies in the target context: where they help the network administrator.

No description available.

<p>The world is increasingly coalescing, ecologically, economically and culturally. Many problems can no longer be solved within the own state borders and the limitation of the territorial state is obvious. Jürgen Habermas means that a <i>world domestic politic</i> without a world government is what this progress need. Therefore it is important that national interests become less central and the solidarity between people is given priority in international relations. </p><p>The focus of this thesis is therefore a critical discourse analysis of the current position of the internationalisation of Swedish security and defence policy. </p><p>The discourse analysis shows that the morality and solidarity is described as important issues for the increasing Swedish international military engagement. One conclusion of the discourse is that the peace no longer is something that Sweden retains on it’s own. Instead the peace is secured in co-operation with other states. Hence, in the presence of thefuture, it’s interesting to consider Immanuel Kants thought, <i>zum ewigen Frieden</i>.</p>

<p>In the course of this master thesis I will argue the following:</p><p> a) ESDP project is an interesting initiative and concern issues that stand at the core of the EU integration processes. It relates to the most significant and updated development of the EU institutional, conceptual and strategic design, but is yet relatively unexplored and underdeveloped. </p><p>b) The aim of this study is to evaluate the efforts to enhance cooperation among European countries in the provision and use of military force. To set the scene and illustrate constrains and complications that bear upon activities in this field. Indeed, the author intends to recommend a theoretical framework, as a fundamental prerequisite for the proper study of EU Defense and Security Policy. </p><p>c) Constructivism and neo- Realism and their theoretical tenets offer an unexplored avenue to investigate and account for the development of the European Security and Defense Policy. </p><p>d) The efficiency of such an account depends on a meticulous evaluation of proposed theoretical approaches versus the emerging security complex. This theoretical choice allows for a construction beyond that of the unit or system levels of analysis and may therefore grant a causal role to perceived interests in terms of non- traditional approach to research in social science. Also it may thereby provoke an interest in terms of security and threat. </p><p>e) The originality and validity of a combination between Realism and Constructivism as a starting point for inquiries in IR may not only be relevant to an understanding of how such a development can unfold, but mostly how a real social phenomena can be unfolded by such a non-traditional theoretical approach.</p>

<p>In the post Cold-War era, world politics was transforming itself through its emerging complex issues such as terrorism and influential and interdependent actors such as the European Union. In this new era, the European Union was developing its Common Foreign and Security Policy pillar both to present a coherent and unified EU policy and to prove its political potent in order to become an influential actor on world politics. On the other side, security environment was also transforming its content through emerging actors and issues. As one of the most prominent actors of the world politics, the EU was influenced by the transformation of security environment, whose economic ‘soft power’ proved necessary but insufficient for being a global power in this emerging security environment. Insufficiency of economic power in solving security problems became more visible with the terrorist attacks of September 11 and March 11 which proved the seriousness of a globalized security threat posed by terrorism. After the events took place, the EU’s security approach and threat assessment have been transformed in which the issue of terrorism occupied more profound place by ‘securitization’ of its context. The Common Foreign and Security Policy of the EU began to play more prominent role on EU policies together with incorporating the efforts on the issue of fight against terrorism both to EU’s external relations and to its security dimension. Therefore, in this study, the author analyzes the research question of the development of the CFSP of the EU together with the impact of the issue of terrorism in this transforming security environment. Since examination of such a complex security issue necessitates multidimensional approach, then liberal and realist theories are used as complementary analytical instruments guiding the theoretical framework of the study.</p>

<p>This dissertations aims to examine the EU Foreign Policy, and more precisely map the High Representative (HR) and his impact on the Common Foreign and Security Policy (CFSP) in the EU. Using two theoretical frameworks, leadership theory and institutional theory, the study tests the explanatory power of these theories to explain the HR and his impact on the CFSP. The study is limited to a period of time, from November 2002 until December 2003, when several different events took place within the framework of the CFSP. The conclusion indicates that both leadership theory and institutional theory can help explain the development and outcomes of the CFSP.</p><p>Keywords: EU foreign policy, Common Foreign and Security Policy, High Representative of the CFSP, European Security and Defence Policy, Iraq war, European Security Strategy</p>

In der Diskussion um die internationale Rolle Europas ist die Gemeinsame Außen- und Sicherheitspolitik (GASP) Gegenstand häufiger Kontroversen. Ist die EU-Außenpolitik „das blutärmste Produkt der europäischen Integration“ (Kagan 2002) oder gar Beleg für eine wachsende Kluft zwischen Erwartungen und Fähigkeiten (Hill 1998)? Deutlich im Gedächtnis ist noch die Zerrissenheit und Einflusslosigkeit der europäischen Außenpolitik während des Irakkrieges 2003. Sind entsprechende Bemühungen der EU also nicht der Rede wert? Sind die Vorschläge zu Reformen der Verfahren und Institutionen, wie sie der Europäische Konvent zur Zukunft Europas und die anschließende Regierungskonferenz zuletzt vorlegten1, nur Sandkastenspielzeug für Politikwissenschaftler? Oder verspricht der geplante Verfassungsvertrag den strategischen Durchbruch, der die EU zu einem wirklichen außen- und sicherheitspolitischen Akteur im internationalen System werden lässt? / The institutional set up of the EU’s Common Foreign and Security Policy (CFSP) has been a highly controversial issue on the agenda since its creation. In light of the forthcoming enlargement, the European Convention proposed an institutional reform of the CFSP in July 2003. The reform envisages, among other things, the establishment of an Union minister for foreign affairs instead of the rotating presidency. The hybrid institutional nature of the CFSP makes prognoses very difficult, especially with regard to the division of labour within the EU. New flexible modes of cooperation may become a common feature in the EU-25. „Structured cooperation“ is likely to strengthen EU crisis management.

In the course of this master thesis I will argue the following: a) ESDP project is an interesting initiative and concern issues that stand at the core of the EU integration processes. It relates to the most significant and updated development of the EU institutional, conceptual and strategic design, but is yet relatively unexplored and underdeveloped. b) The aim of this study is to evaluate the efforts to enhance cooperation among European countries in the provision and use of military force. To set the scene and illustrate constrains and complications that bear upon activities in this field. Indeed, the author intends to recommend a theoretical framework, as a fundamental prerequisite for the proper study of EU Defense and Security Policy. c) Constructivism and neo- Realism and their theoretical tenets offer an unexplored avenue to investigate and account for the development of the European Security and Defense Policy. d) The efficiency of such an account depends on a meticulous evaluation of proposed theoretical approaches versus the emerging security complex. This theoretical choice allows for a construction beyond that of the unit or system levels of analysis and may therefore grant a causal role to perceived interests in terms of non- traditional approach to research in social science. Also it may thereby provoke an interest in terms of security and threat. e) The originality and validity of a combination between Realism and Constructivism as a starting point for inquiries in IR may not only be relevant to an understanding of how such a development can unfold, but mostly how a real social phenomena can be unfolded by such a non-traditional theoretical approach.

In the post Cold-War era, world politics was transforming itself through its emerging complex issues such as terrorism and influential and interdependent actors such as the European Union. In this new era, the European Union was developing its Common Foreign and Security Policy pillar both to present a coherent and unified EU policy and to prove its political potent in order to become an influential actor on world politics. On the other side, security environment was also transforming its content through emerging actors and issues. As one of the most prominent actors of the world politics, the EU was influenced by the transformation of security environment, whose economic ‘soft power’ proved necessary but insufficient for being a global power in this emerging security environment. Insufficiency of economic power in solving security problems became more visible with the terrorist attacks of September 11 and March 11 which proved the seriousness of a globalized security threat posed by terrorism. After the events took place, the EU’s security approach and threat assessment have been transformed in which the issue of terrorism occupied more profound place by ‘securitization’ of its context. The Common Foreign and Security Policy of the EU began to play more prominent role on EU policies together with incorporating the efforts on the issue of fight against terrorism both to EU’s external relations and to its security dimension. Therefore, in this study, the author analyzes the research question of the development of the CFSP of the EU together with the impact of the issue of terrorism in this transforming security environment. Since examination of such a complex security issue necessitates multidimensional approach, then liberal and realist theories are used as complementary analytical instruments guiding the theoretical framework of the study.

This dissertations aims to examine the EU Foreign Policy, and more precisely map the High Representative (HR) and his impact on the Common Foreign and Security Policy (CFSP) in the EU. Using two theoretical frameworks, leadership theory and institutional theory, the study tests the explanatory power of these theories to explain the HR and his impact on the CFSP. The study is limited to a period of time, from November 2002 until December 2003, when several different events took place within the framework of the CFSP. The conclusion indicates that both leadership theory and institutional theory can help explain the development and outcomes of the CFSP. Keywords: EU foreign policy, Common Foreign and Security Policy, High Representative of the CFSP, European Security and Defence Policy, Iraq war, European Security Strategy