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With the increased application of Wireless Sensor Networks (WSNs) in military, commercial, and home environments, securing the data in the network is a critical issue. Several security mechanisms, such as TinySec have been introduced to address the need for security in WSNs. There are many applications, however, which require more than just protecting the data at a single level. For those applications, it is necessary to provide MultiLevel Security (MLS) that can accommodate the different sensitivity levels of information as well as the different clearance levels of the users. In this paper, the authors apply the concept of MLS to the field of WSNs by employing the approach of Multiple Security Levels (MSL).
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