確保雲存儲中的資料機密性是一個日益重要的問題。訊息機密性、用戶隱私和訪問控制是影響雲存儲中提供數據共享服務幾項重要的問題。但是，在保護用戶隱私的同時仍要保障數據下載的訪問控制方法仍然存在著未解問題。基於屬性加密的密文策略演算法提出了一種針對共享數據的參與方數據加密/解密機制。因此，該算法已成為數據共享訪問控制的流行解決方案。但是，將當前的基於屬性加密的密文策略演算法方案直接應用在雲存儲中仍然不可行，因為這些方案採用了單一的權責管理機構且加密/解密演算法沒有效率，也沒有包含屬性的撤銷機制。為了解決上述問題，本文中，我們分別實現了帶有撤銷機制的基於屬性加密安全數據共享方案，並應用於車載行動網路和電子健康記錄系統的安全數據共享上。特別是這些用戶大多使用計算能力受限的電子設備存取資料，所以，為了減輕用戶設備的運算負擔，我們將一部份計算密集的加密和解密操作外包給雲計算節點。通過全面的實驗結果和安全性分析表明，我們的方案在保障用戶隱私的同時，也實現了細粒度的訪問控制。通過實驗進行性能分析表明，我們提出的方案適用於雲存儲的數據共享用例。

Ensuring data confidentiality in the cloud storage is an increasingly important issue. Message confidentiality, user privacy and access control are the most important problems that affect services provided by data sharing in the cloud storage. However, access control that addresses data downloads while preserving users' privacy remains an open problem. Based on a set of attributes, the ciphertext-policy attribute-based encryption (CP-ABE) algorithm proposes a party data encryption/decryption mechanism for shared data; consequently, the algorithm has become a popular solution for data-sharing access control. However, the current CP-ABE schemes are still infeasible for cloud storage because these schemes use a single authority and inefficient encryption/decryption and ignore revocation mechanisms. Here, over CP-ABE with revocation, we introduce the attribute-based schemes that achieve secure data sharing for vehicular ad hoc network (VANET) and electronic health record (EHR) system, respectively. To reduce the computation load for user’s devices, we outsource computationally intensive encryption and decryption operations to cloud compute nodes. Comprehensive experimental results and security analysis show that our scheme achieves fine-grained access control while preserving user privacy. Through implementation, performance analysis demonstrates that our scheme is suitable for data sharing in cloud storage usage.

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