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The first mile wireless access of convergence networks is prone to various attacks due to the broadcasting feature of transmission. Most of the existing security measures focus on protection of message contents, leaving the header part in plain text. Therefore, the header part that has source and destination address, when transmitted in plain text, can reveal the information that can be useful for traffic analysis attack. In this paper, a master node generates pseudonym sets for slave nodes by using Unique Pair Sequence (UPS), assigns each set to a node and to itself. The assigned set and master set are transmitted to all the nodes.
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