Research On Information Retrieval Technology Of Secret Information Checking System

Nowadays, the Internet has been developed rapidly. But it not only brings abundant resource and convenient service for us, but also brings many risks. The losing of data, the stealing of secret information, numerous similar cases damaged the interests of Internet users, especially for military, government departments and so on. As an important tool for LAN terminal secret information checking system for protected data by checking classified data and system vulnerabilities.To solve this problem, we completed the design of secret information checking system. As an important tool for enterprises and institutions to detect classified data and system operation of LAN terminals, it greatly enhances data protection. The paper studied the terminal information retrieval technology which is the main part of secret information checking system. Different from web searching technology, it checks storage data of personal computer, help users understand the data content of their computer. Because accuracy is very important for terminal information retrieval technology, it finds information with the help of pattern matching algorithm.After analyzing several classic pattern matching algorithms, the paper proposed a new multi-pattern matching algorithm—NKMP algorithm, which matches multiple patterns in a matching process based on the idea of KMP algorithm. It adopts skip matrix to record the next location of moving and adopts Charset CSet of patterns to skip the extra characters and avoid unnecessary matching process. Experimental results proved that the new algorithm enhanced the speed of matching effectively, having better time complexity and space complexity. On the basis of these studies, we design and achieve terminal information retrieval function. With the help of XML database, our system provides prior information for the next search, reduce the costs.Finally, the test results proved that:secret information checking system can not only protect computer data security, but also has good performance, can improve retrieval speed and has high accuracy.