我們依賴甚深的資訊技術，隨著時間不斷的在創新與進步，越來越多的新技術帶給我們生活更多的便利，尤其是網際網路上的種種應用，從電子商務、電子報、視訊會議等等，在在改變了我們以往所熟悉的生活模式，提供另外一種不一樣的選擇；而一個安全、迅速、可靠的線上且即時的通訊環境是這一切的不可或缺的基礎。
本論文討論在一個線上且即時的環境中，可能會遭遇到的問題；並提出一套完整且可行的方法，讓使用者能正確、安全、迅速的享用資訊科技

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