近年來由於個人通訊及網路科技快速的進步，造成人類生活上型態上重大的改變。
在網路方面，近年來由於政府以及廠商大力的提倡全民上網，因此網路在很短的時間內便深入每一個家庭。而從最早期的窄頻撥接上網，到現在只需要少許的錢便可以寬頻到家，其變化與進步不可謂不大。到了最近，網路更是開始嘗試擺脫網路線的束縛，準備從有線的網路進入無線區域網路（Wireless LAN）的新紀元。
這篇論文是希望從無線區域網路的角度出發，結合目前個人無線通訊的理念來克服各種在無線區域網路環境下進行通訊所碰到的困難，並在越來越重要的『通訊安全』上加以著墨及改進，希望可以達成『在無線區域網路環境下進行安全且即時的通訊』的這個目標。

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