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檔案同步備份與保密安全系統之設計與實現

Design and Implementation of a Secure File Synchronization and Backup System

摘要


現代化的企業營運愈來愈依賴資訊系統,使得採用磁碟儲存設備的相關應用也急速地擴張,進而引發了儲存設備管理與安全備份解決方案的需求快速增長。在IDC的「2004年上半年亞太儲存軟體追蹤半年報」報告中也指出了台灣地區儲存軟體市場在今年上半年度較去年同期成長了52%,而其中成長的主要力道來自於儲存資源管理軟體。然而目前企業組織所採用的備份機制,仍然是以鏡像停機的備份管理居多,卻鮮少以檔案即時備份的架構來進行直接備份管理。本論文以目前使用較爲普遍的NTFS檔案系統作爲檔案資料備份工作環境,實際建構了一個檔案同步備份與保密安全系統,該系統可以在指定目錄資料夾下,不論是本機或網路端的位置,均能對檔案做即時監看與同步安全備份。在此系統程式中,使用者可以透過事先設定好的資訊,將監看目錄資料夾內的檔案資料利用檔案加解密演算法與檔案驗證的方式產生並複製一份具備保密安全功能的備份至指定的目錄位置中,達成檔案複製備份與資料保密之目的。我們也對整個系統做了實驗性的效能評估,發現即使在檔案公用的情況下,只要採用一般大眾的個人電腦基本配備,就可以依系統實際執行的評估數據,在檔案數量低於500個的情況下,達到100%的安全複製能力。這讓我們的系統很適合台灣中小企業在備份作業上的實務運作需求。

並列摘要


As the daily business operation of enterprises gradually rely on information systems, the applications of common enterprise storage proliferate rapidly, which caused the demands of a secure management solution for backing up useful files. One of the surveys in IDC regarding ”Asia/Pacific Semiannual Storage Software Tracker, H1 2004” has pointed out that on the first half of the year in 2004, the growing of the market in Taiwan for storage management solution has been lifted up to 52%, when comparing to the same period of last year. The growth mainly comes from the market of storage management software. However, the commonly used backup mechanism for most of the enterprises still needs to be accomplished by shutting down systems with image mirroring management. They rarely adopt on-line and real-time approaches to backup files directly. In this paper, we propose a solid system design on top of the popular NTFS file system, to practically implement a backup environment for critical files. Besides, we have implemented a practical and secure file backing up system, which backs up monitored files or directories with encryption to a dedicated destination. According to our experiment, the result shows that the system can safely back up files without loss by using only ordinary personal computers, when the monitored files are less than 500. That makes our system a very practical and feasible solution for most of the small and middle enterprises in Taiwan.

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