近年來，智慧型行動裝置發展快速，持有人口也逐年增加。科技的發展，相對提高了智慧型行動裝置的便利性，因此 SONY、Philips及 Nokia以非接觸式射頻識別（ RFID）為基礎共同開發出近端通訊。近端通訊的特點為耗電量低、一次只和一台機器連結並且擁有較高的保密性與安全性，因此目前近端通訊的應用大都以門禁及付款為主。本研究以線上遊戲帳號為例，架構出一套以內建近端通訊功能的行動裝置結合 NFC Tag的雙因素驗證機制。 隨著線上遊戲的盛行，遊戲裡面的虛擬寶物也漸漸被賦予實體的價值，因此也衍生出很多盜取帳號或虛擬寶物的案件。目前許多遊戲公司也開始提供雙因素身分驗證的機制，雖然提供的機制能讓遊戲帳號多一層的保護，但使用者可能要付出額外的驗證器材費用或是使用不夠人性化的驗證方式。本研究將線上遊戲帳號結合 NFC手機及 NFC Tag，進行雙因素身分認證，使用者使用行動裝置靠近方便攜帶的 NFC Tag，經過驗證伺服器驗證後，再輸入遊戲帳號密碼，即可立即登入遊戲。

With technology development, the number of users of smart mobile devices has also grown steadily in recent years. This is mainly due to the convenience offered by smart mobile devices. Based on the wireless non-contact Radio-Frequency Identification (RFID) technology, SONY, Philips, and Nokia jointly developed the Near-Field Communication (NFC) technology. NFC, characterized by lower power consumption, connectivity with one device at a time, and higher confidentiality and security, is mainly used in door access and payment applications. This study used online game and Telecom Based Micropayment as examples to develop a two-factor authentication mechanism for mobile devices built with NFC functionality. With the increasing popularity of online games, virtual goods in the games have gradually been given a value like physical goods. Many problems such as account fraud and thievery of virtual goods have therefore derived. In the present, many gaming companies have used two-factor authentication of user identity. Although such mechanism offers additional protection of user accounts, the verification is not user-friendly enough, and extra cost of the verification device may be incurred. This study proposed to integrate online gaming accounts and NFC tags for two-factor authentication. Users only need to use their mobile device built with an NFC sensor to communicate with portable NFC tags for server authentication. Later, they can input their account and password to log into the game.