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Research on Secure Index Structure of Cipher-text Retrieval System

Author: SongSai
Tutor: LiRuiXuan
School: Huazhong University of Science and Technology
Course: Applied Computer Technology
Keywords: Full-text Retrieval Inverted Index Cryptography Index Secure Index Structure Key Management
CLC: TP391.3
Type: Master's thesis
Year: 2009
Downloads: 60
Quote: 0
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Abstract


Along with the development of the information society at the top speed, the information resource is increased day by day. The full-text retrieval technique provides a high-efficient means for searching of information resource, whereas increasingly more problems occur to the information security. In some area requiring high-grade security, the search and utilization of the archive and information resource must be based on the high-graded security. Thus, the combination between the encryption technology and full-text retrieval technology is required, and the full-text index based on the archive information resource is constructed to provide secure and high-efficient retrieval.Till now, the research in the area of the full-text retrieval technology and encrypted data base both at home and abroad are mature, whereas the full-text retrieval based on the encryption technology is expected to have more development. Moreover, the prior research concerning full-text retrieval based on encryption fails to solve the index security problem in a proper manner. Therefore, the present research project exactly relates to the improvement of the security of the index structure, and aims to enhance the capability against the attack on the basis of ensuring the capability of index.With respect to the aforesaid problems, the present thesis provides an improved secure full-text index structure, wherein the inverted index is constructed on the basis of the encrypted vocabulary entry against the attack of semantic analysis. Two-level index structure and the partitioning encryption mechanism thereof ensure the balance between efficiency and security. In the inversed document, the position of vocabulary and the frequency information are screened out for resistance of statistic-based attack. The access control policy based on the index structure ensures that the searching operation is conducted in the area of user permission. With respect to said secure full-text index structure, a segmentation method for Chinese characters is designed to meet three special requirements concerning the inversed vocabulary of encrypted fill-text index, namely small granularity of the vocabulary entry, high coverage ratio of the entry and appropriate size of the inversed vocabulary. In terms of said secure full-text index structure, a secure and high-efficient cipher full-text index mechanism is designed, including construction and maintenance of the encryption index, as well the cipher full-text retrieval. In terms of said secure full-text index structure, a design concerning encryption solution for the cipher full-text index is provided in three aspects of the encryption hierarchy, the encryption granularity and encryption algorithm, and also a multi-hierarchic key management strategy is provided therein.Finally, based on the aforesaid achievements, a prototype Mimir of the encryption full-text retrieval system is designed and implemented, and the core module thereof is programmed on the basis of Lucene. A performance testing is conducted on the encryption full-text index and retrieval based on the experimental environment of Mimir, wherein the excellent balance between efficiency and security of the system is proved.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Retrieval machine
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