在電子商務發達的現代，透過網際網路購買數位商品，已成了不可阻擋的趨勢。然而欲讓顧客在購買及付費的過程中，其身分及所購買的數位商品能不被洩漏給其它人，甚至包含對電子商家及對儲存數位商品的伺服器；使顧客的隱私權得到保障，這對設計資訊安全機制的設計者來說，是很大的挑戰。在本篇論文中，我們提出一個結合電子現金付費功能的安全機制以保護顧客的隱私權，解決在網際網路上因購買、付費及傳遞數位商品，所帶來顧客個人身份或購買資訊洩漏的問題，真正達成顧客隱私權的保障。對於透過網際網路進行交易的消費者而言，我們所提出的機制不僅有效地達成顧客隱私權保護，因結合電子現金付費機制在電子商務的環境中更顯得實用與安全。

In the current era of e-commerce, purchasing digital products on the Internet is a popular trend. However, ensuring the confidentiality of customers’ identities and their purchased products, including to the online shops and servers, and protecting the privacy of customers during the process of purchase and payment transaction is a great challenge to the designers of information security mechanism.This paper proposes a security mechanism that combines e-cash payment function to protect the customer privacy, in order to solve the problem of personal information leakage when purchasing, paying for, or transmitting digital products
online, and achieve the protection of customer privacy. For consumers of online transactions, the proposed mechanism can effectively achieve the customer privacy protection, and make the e-cash payment mechanism more practical and secure in the e-commerce environment.