「具備關鍵字搜尋之公鑰加密」已成為在雲端環境中確保資料搜尋安全的重要
密碼學技術。然而，傳統的 PEKS 方案由於依賴單一可信賴伺服器，往往面臨金鑰暴露的風險，且在使用者管理過程中會產生高昂的通訊開銷。本論文提出了一種結合基於區塊鏈之共識委員會的新穎「具備關鍵字搜尋之公鑰認證加密」機制。透過利用分散式門檻金鑰生成與部分金鑰請求協定，我們消除了單點故障的問題，並降低了私鑰外洩的風險。此外，我們的方案導入了動態授權調整功能，允許資料擁有者有效率地新增或撤銷授權使用者，而無需對整個資料集進行重新加密。安全性分析與效能評估證明，所提出的方案不僅顯著減輕了通訊負擔，同時也為動態環境提供了強健的隱私保護與靈活性。

Public Key Encryption with Keyword Search (PEKS) has become a crucial primitive for securing data search in cloud environments. However, traditional PEKS schemes often suffer from key exposure risks due to reliance on a single trusted server and high communication overhead during user management. This paper proposes a novel Public Key Authenticated Encryption with Keyword Search (PAEKS) mechanism integrated with a blockchain-based consensus committee. By leveraging a distributed threshold key generation and partial key request protocol, we eliminate the single point of failure and mitigate the risk of private key leakage. Furthermore, our scheme introduces a dynamic authorization adjustment feature, allowing data owners to efficiently add or revoke authorized users without re-encrypting the entire dataset. Security analysis and performance evaluation demonstrate that the proposed scheme significantly reduces communication burdens while providing robust privacy protection and flexibility for dynamic environments.

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