| 摘要 |
An apparatus and method for detecting duplication of a portable subscriber station (PSS) in a portable Internet system are provided. A master key of a PSS and a master key of an AAA server are identically updated whenever the PSS succeeds in authentication. It is possible to determine whether the PSS is duplicated or not by comparing the master key of the PSS with the master key of the AAA server during an authentication procedure. In addition, it is possible to find out whether duplication for the corresponding PSS is made by a user's own volition or by a third party by additionally performing an authentication procedure which requires an input of a password for a PSS which is doubted as duplicated.
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