隨著電腦科技與網際網路快速的發展，使用者的閱讀習慣也逐漸從傳統紙本的模式，轉變成利用行動裝置進行閱讀電子書的模式。電子書將是未來人們閱讀型態的新趨勢，而如何保謢電子書之合法版權避免被非法使用，將是電子書要面對的問題之一。由於目前的數位版權管理機制過度的保護，限制使用者的行為，很難從商業模型的觀點實現。故本研究中基於二手電子書的概念設計新的系統模型，主要著重在兩個關鍵議題：如何安全地傳輸數位內容，以及如何讓使用者合法使用二手數位內容。本研究所提出的方法搭配對稱式密碼系統、非對稱式密碼系統以達到數位內容安全地傳遞與溝通雙方傳遞資料的完整性與機密性，並且運用數位簽章方式達到傳遞過程的不可否認性。

With the development of network technology and the rise of Internet, the reading habit of people is gradually changed from reading traditional paper-made books to electronic books on mobile devices. Therefore, it is an inevitable trend that eBooks will be the future mainstream of reading. Furthermore, it is important to protect the legal rights of each eBook. Most of the previously proposed digital rights management mechanisms only focused on the protection technology for digital contents. Unfortunately, such mechanisms usually restrict user behaviors and hard to be realized from a business model point of view. In this thesis a new system model, based on the concepts of second-hand eBook transaction is proposed to support second-hand eBook distribution and corresponding business model. The proposed system focuses on two major issues: how to transfer digital content safely and how to allow users to legally access second-hand digital content. Our system achieves integrity and confidentiality for the electronic data transmitting through Internet. In addition, non-repudiation property is also considered and embedded in system design. The system adopts symmetric cryptosystem, asymmetric cryptosystem and digital signature to build a secure transmission environment.

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