海量数据加密存储与检索系统的研究与实现-计算机应用技术专业论文.docxVIP

华 华 中 科 技 大 学 硕 士 学 位 论 文 II II Abstract With the information age’s coming, the security of data storage and retrieval has become all walks of life, institutions, enterprises and even individuals already facing the problems. However at this stage a number of technical solutions can not completely solve the secret data storage, retrieval and some other specific needs. The current encryption technology is very mature to ensure data secure storage, and information retrieval technology has also made great progress, but our data mining technology in the relatively late start of the study, especially information retrieval technology in the cipher text data. Although we can make the data stored encrypted, but to retrieve the specific information from the mass unstructured cipher text data is very difficult. Study the content of the vast amounts of unstructured data security , file encryption and key management system, and how to adaptively and efficiently compress, store file and address it quickly, how to build a security index files and efficiently retrieve under the condition of not to compromise security state of compressed text files. Also designed a more fine-grained access control for specific needs, such as some certain property values of file, some sensitive words whether they are visibility for some users and so on. A general solution and implementation is Proposed with an open framework prototype system. First, design a unified XML format to standardize documents and store data. Second, hash multi-level directory structure to implement file archiving. Third, design reasonable inverted index for document retrieval functions of documents. System provides reasonable access control mechanisms to system security, it provides a multi-level encryption protection for important high-level classified data, it is designed in rational strategies to manage the multi-level keys. The file dat