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    Title: 雲端儲存系統中支援動態資料之公開稽核技術之研究
    Other Titles: Public auditing with dynamic integrity for cloud storage
    Authors: 李怡緯;Li, Yi-Wei
    Contributors: 淡江大學資訊工程學系碩士班
    黃仁俊;Hwang, Ren Junn
    Keywords: 雲端運算;隱私權保護;公開稽核;動態操作;Merkle雜湊樹;Cloud Computing;Privacy-Preserving;Public Auditing;Dynamic Operation;Merkle Hash Tree
    Date: 2012
    Issue Date: 2013-04-13 11:54:43 (UTC+8)
    Abstract: 雲端儲存資料外包(outsourced)是雲端運算的服務項目中最為普遍且成熟的項目,但如何確保存放於雲端的資料的完整性(integrity)與正確性(correctness)卻是此應用推廣必須積極面對的課題。委由一個可信的第三方稽核者(Third Party Auditor)對雲端儲存資料進行稽核(auditing)機制,因其不增加使用者的負擔並同時顧及使用者的隱私(privacy)保護故是具體有效的解決方案,然而檔案資料龐大且有必須顧及資料私密性,採行Merkle hash tree予以輔助是目前常見的有效率作法,但由於使用者對檔案區塊的修正、插入與刪除等動態操作,僅直接採行Merkle hash tree依然造成整體稽核機制效能不彰,本論文提出採用Merkle hash tree的雲端儲存稽核機制在動態操作過程Merkle hash tree中子樹調整基準與進行重建之方法,使稽核機制稽核過程不僅能夠保護使用者資料,更能充分提供使用者對檔案進行有效率的動態操作,但卻不會如原來因直接採行Merkle hash tree而造成通訊成本以及使用者和稽核者計算成本增加的弱點。本論文方法適合於各種採行Merkle hash tree之稽核機制在不影響其原來稽核功能及安全性前提下,使其有效率地提供動態操作功能並增強其實用性。
    Outsourcing data to cloud storage is one of the most common and mature application of all kinds of cloud services. How to verify the integrity and correctness of the user’s data in the cloud storage is a really serious problem in the cloud-based application. The general solution is to authorize a trusted third party auditor to audit the data in the cloud storage from time to time. It will be a concrete and efficient solution, if it makes no additional burden to the user and takes the user''s privacy into consideration at the same time. Because of lots of data files in the cloud storage, many solutions use Merkle hash tree technique to enhance the efficiency and guaranteeing the privacy. Merkle hash tree of each data file will be askew after performing many dynamic data operations such as inserting or deleting of data block. The performances of many cloud storage public auditing schemes based on Merkle hash tree are poor by this case. The paper proposes an efficiency method to adjust Merkle hash tree in the dynamic data operation. The proposed scheme can be embedded into any cloud storage public auditing scheme based on Merkle hash tree technique. The public auditing scheme includes the proposed method will provide the dynamic operations efficiently without losing the privacy-preserving functionality.
    Appears in Collections:[資訊工程學系暨研究所] 學位論文

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