資訊時代下的資訊快速流動與國家安全的交集－關鍵基礎設施的保護，是資訊時代下的共通議題。這樣的議題在美國歷經九一一事件後更突顯其重要性。在保護關鍵設基礎施政策制定與實踐的過程中，除了定義關鍵基礎設施外，政府與民間的資訊共享對於保護關鍵設基礎施的成效往往有舉足輕重的地位，而美國在此議題可能產生的執行上爭議與解釋亦有相當豐富的經驗與討論，相關聯邦法律（國土安全法、愛國者法以及資訊自由法及其例外規定）必須加以討論來說明美國在此議題上的態度與作法。尤其重點在資訊共享關於個人資訊隱私的互動與相關最新發展，藉此說明美國關於資訊分享與個人資訊隱私的互動。其後對於我國的目前現況加以介紹，並在最後提出本文的觀察與建議。

The common topic under the Information Age between the fast flow of information and the national security is the protection of critical infrastructure. The topic of protecting critical infrastructure is more prominent after the occurrence of 911 Events in the United States. And in the process of making and enforcing the policy for the protection of critical infrastructure, the concept of information sharing between the governmental agency and the private entity is crucial to the success of protection. Since the United States has accumulated sufficient practical experience and discussion to illuminate the practical dispute or/and interpretation for prosecuting information sharing, several federal legislations discussed in this article will clearly indicate the current policy approach in encouraging information sharing and be worth of noticing. Especially, the central of discussion converges on the interaction between the information sharing and the information privacy protection, including the recent development. The article is going to conclude with observation and suggestion to the status quo of protecting critical infrastructure in Taiwan subject to learning experience from the United States in striving for protecting critical infrastructure.