Full text search system based on ciphertext

Abstract

Full text index system based on cryptograph relates to data bank, enter module, demand module, result gather dispose module, electronic document dispose module, index module, audit manage module, user manage module and purview manage module. The demand module relates to demand participle module, demand encryption module, logic combination module, demand sub-module, visiting controlled module and result gather dispose module. Result gather dispose module relates to tabloid module and snapshot module. Index module relates to index participle module, index encryption module and index sub-module. The system offers a kind of participle strategy-the Chinese acceptation combines with automatic syncopation, without the position instance for index words in the original text. During the user visiting the document, add visiting domination to restrict user purview and to keep the security of sensitive information. It can realize full text index with cryptograph and keep the security of sensitive information with strong safety and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of computer retrieval, and in particular relates to a ciphertext-based full-text retrieval system. Background technique [0002] The information age has produced a large amount of digital information, among which text information is the most basic and most commonly used storage form. In order to find what they need in the vast amount of text information, people urgently need an efficient retrieval tool. How to efficiently store and query unstructured data such as text is a problem worthy of research. Among them, full-text retrieval technology and full-text database technology have become the research hotspots of domestic and foreign scholars. [0003] Full-text retrieval is a technology that takes text data as the main processing object, based on full-text indexing, and uses natural language for retrieval. In the field of information retrieval, full-text retrieval has always been a relatively complicated p...

AI Technical Summary

Problems solved by technology

Although full-text retrieval technology and encryption algorithms are very mature and there are good commercial products, how to realize full-text retrieval under the premise of ciphertext is still blank in the field of related research and products at home and abroad.

There are many difficulties in the combination of encryption technology and full-text indexing. First, in order to ensure the security and reliability of index information, the information of index items must be encrypted. After encryption technology processing, the ciphertext information cannot be in the plaintext state. Therefore, the text information processed by the encryption technology cannot be directly combined with the existing full-text search mechanism to realize the ciphertext full-text search

Secondly, existing full-text retrieval systems often build full-text indexes, so the amount of data indexed is often large, and encryption technology will further increase the amount of information. As a practical system, encryption technology is introduced into the full-text retrieval system Efficiency issues must be considered and highly valued

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