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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/34191

    Title: 多層次文件加密方法之研究
    Other Titles: A study of multilevel text encryption methods
    Authors: 邱裕翔;Chiu, Yu-hsiang
    Contributors: 淡江大學資訊管理學系碩士班
    梁德昭;Liang, Te-chao
    Keywords: 角色權限控管(RBAC);加密演算法;Role Base Access Control (RBAC);Encryption Algorithm;Key Management
    Date: 2009
    Issue Date: 2010-01-11 05:00:58 (UTC+8)
    Abstract: 現在的文件加密是屬於單檔加密為主,而在文件當中有許多不同的機敏感資訊,在不同權限和身分的人員應該是有不同的資訊獲取權。本研究提出一套能夠針對文件當中,不同層級且不同機密程度的文字段落,予以加密和權限控管的方法。此外,就加密後產生的金鑰之管理,提出以角色為基礎的權限控制(RBAC)金鑰管理機制,做為控管加密後產生金鑰的方法。此金鑰管理方法對於不同身分權限的使用者,可以利用角色金鑰去取得該文件資訊內容。
    The file encryption technique is mainly developed for encoding the entire file or document nowadays. However, the users with different authority and identification would have the different right for information acquisition according to the confidentially sensitive information. This research proposes an encryption method to assign authentications for different portions (i.e., paragraphs) of a document with various levels of confidentiality, and to manage the assigned authentications. In order to manage the keys generated by the encryption method, this research introduces a Role-Based Access Control (RBAC) mechanism for it. Additionally, this RBAC managing approach could restrict the access of content within a paragraph in a document to the authorized users via the corresponding key of its represented role.
    The encryption format of documents used in this research is the general format of the extensible markup language (XML). The encrypted documents could be accessed and read dynamically through the technique of document object model (DOM) in XML. This DOM technique also improve the ease of encryption and preservation of documents. In practice, the key decoding mechanism could be accomplished through its own specific decoder for the encrypted documents. This also provides the convenience for users to access and read the documents in the original or familiar format without even perceiving the documents are encrypted.
    The encryption method proposed in this research could realize and accomplish the encryption of a paragraph or several paragraphs in a document. A single document is no longer needed to be encoded entirely with the same level of encryption. It becomes possible for a document to encode different paragraphs with different levels of encryption according to the needs for achieving the appropriateness of file encryption. Consequently, the decreasing confidentiality and increasing security of a document could be achieved by hiding the information of confidentiality and sensitivity via the inner document encryption. The non-confidential information and knowledge could be then shared by more users.
    Appears in Collections:[資訊管理學系暨研究所] 學位論文

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