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Online code dissemination in wireless sensor networks is an important means of remote task reallocation, software update of nodes and network function reconfiguration after a wireless sensor network is deployed. This paper firstly summarizes the researches on the online code dissemination and classifies them into three types: the transmitted object optimization algorithm with the purpose of reducing the data traffic and improving the energy effectiveness, the security authentication algorithms based on public key cryptograph and the security authentication algorithms based on the symmetric key cryptograph. Based on the in-depth analysis of various algorithms, the authors point out their advantages and disadvantages.
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