在資訊科技與網際網路的快速發展下，民眾已將許多日常的事務藉由網路來完成。政府面對快速變遷的科技時代，為了積極跟上國際的腳步，我國政府開始推動電子化政府，並將推廣自然人憑證應用列為重點工作，希望藉由網路提供更便捷與快速的便民服務。由於自然人憑證能有效地解決網路身份辨識不易與資料傳輸安全性不足等問題，因此被視為是電子化政府的基礎建設。
本研究主要探討臺南地區民眾對自然人憑證的使用行為意願及其影響使用因素，採用以「科技接受模型」為主要架構，加入「創新擴散理論」、「信任」等外部變數來加強模型解釋能力，利用紙本問卷進行發放600份，共回收512份有效問卷，採用量化分析方法進行研究，主要研究發現如下：
1.「知覺易用性」會正面影響「知覺有用性」。
2.「使用態度」、「知覺有用性」會正面影響「使用行為意願」。
3.「知覺有用性」、「知覺易用性」、「可觀察性」、「對政府的信任」和「對網路的信任」會正面影響「使用態度」。
根據上述的調查分析結果，本研究提出下列建議，作為政府推動電子憑證的參考，希望藉此提高民眾使用電子憑證的意願：
1.加強自然人憑證之功能特性作為提升使用量的主軸。
2.多利用大眾媒體進行自然人憑證之宣傳。
3.強化政府資安能力以利推行自然人憑證。
4.提供更多元化自然人憑證認證服務管道。

As information technology and the Internet advance rapidly, Citizen Digital Certificate is regarded as the most important foundation of e-government implement in Taiwan. This research focuses on understanding the usage behavior and explores the influential factors that affect the willingness of using Citizen Digital Certificate amongst Tainan area citizens. Technology acceptance model(TAM) was used as the main framework for this study along with Innovation diffusion theory(IDT) and Trust model to enhance the model robustness.
The research was carried out by using paper-based questionnaire survey to collect data. Quantitative statistical analysis models were then used to analyze the feedback information collected from public. This study surveys 600 people, with 512 valid samples. Main findings and results are listed below:
(1)Perceived ease of use is positively related to Perceived usefulness.
(2)Attitude, Perceived usefulness are positively related to Behavioral intention.
(3)Perceived usefulness, Perceived ease of use, Observability, Trust of government and Trust of Internet are positively related to Attitude.
According to the analysis results above, the study provides the following suggestions as the reference for promoting the Citizen Digital Certificate and increasing people’s usage intention:
(1)To enhance the function of Citizen Digital Certificate for upgrading utility rate.
(2)To promote the policy of Citizen Digital Certificate through the mass media.
(3)To strengthen the government’s information security capability in promoting and facilitating Citizen Digital Certificate.
(4)To provide more diversified authentication service for Citizen Digital Certificate.

【網站部分】
行政院國家發展委員會網站：http://www.ndc.gov.tw/
內政部憑證管理中心網站：http://moica.nat.gov.tw/
內政部戶政司網站：http://www.ris.gov.tw/
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