傳統的公文作業流程中，存在著不可避免的人為疏失，如資料外洩，公文流向不易掌握等，致使整體工作率降低，如何改善此一問題，電腦科技之應用，是必然的解決之道。而利用電腦科技，例如利用網路大量傳送資料時，必需考慮資訊之完整性，正確性及安全性。但以往專家學者在研究此類問題時，大多在探討技術層面問題，少有涉及實務管理應用之整合。因此，本研究旨在運用現有的電腦技術，如密碼學中的RSA、DSA等演算法，在儘可能不改變現行公文系統的作業程序下，設計發展出一個實際可行的。子數位簽名公文系統模式，來取代現行之作業方式，並解決一些實際應用上的問題，以提供一個未來在網路上可使用的、安全的電子公文系統。 / In the traditional documentation processing, the problems raised by the employees, such as the leakage of data, the disappear of document had already decreased the throughput of the. organization. In order to fix these problems, the usage of computer and network can be the best solution. With the widespread use of computer and network, completely, correctness, and safety are the key issues we need to consider. During the last twenty years, most of the works were dedicated to the technical side and neglect the integration of the technical and practice. The aim of this research is try to break the wall and combine these two issues together, i.e., use the state-of-the-art technology of cryptographic, such as DSA, RSA, to design a real Electronic Digital Signature system which could simulate and substitute the current system.