The main objectives of the different security services and mechanisms today are to provide privacy of information to ensure that the tools used to establish a proper environment to the user are reliable and trusted. With the dramatic increase of the use of the Internet and its applications that require high level of security services, such as e-commerce transactions and on-line banking, it is quiet useful to formulate a systematic approach to analyze the security services, and countermeasures which are directly associated with each security attack. Taxonomy is one of the keys to understand the security threats that the Internet is facing today and the countermeasure approaches that should be devised in order to keep the Internet as secure as possible. In this paper, we propose a novel Internet security taxonomy. This taxonomy is based on a mapping of today’s Internet security services against the corresponding security attacks and countermeasures. An assessment of the performance of the proposed taxonomy is also discussed
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