Algorithm Research & Explore
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App. Res. of Comp. Printed Article
Vol. 38, 2021 No. 6
1678-1682,1688

Sensitive word filtering algorithm based on improved Trie tree and DFA

Wu Shan1,2
Li Yingxiang2
Xu Hongyan1
Zhang Shixia1
Shi Yijun3
1. School of Intelligent Technology, Tianfu College of Southwest University of Finance & Economics, Mianyang Sichuan 621000, China
2. College of Communication Engineering, Chengdu University of Information Technology, Chengdu 610103, China
3. The 5th Electronic Research Institute of MIT, Guangzhou 510507, China
DOI: 10.19734/j.issn.1001-3695.2020.09.0240

Abstract

By investigating the methods for filtering the sensitive word in the text and the related technologies, this paper proposed a sensitive word filtering algorithm based on the improved Trie tree and DFA to solve the key problems of the sensitive word filtration, including artificial interference, participle obstacles and so on. The algorithm improved the accuracy and validity of sensitive word filtering in text. It consisted of three major steps. Firstly, based on the mathematical theory of permutation and combination, it constructed an algorithm for extending Chinese word to Chinese-phonetic mixed word. Secondly, it employed the improved Trie tree structure to store all the status of DFA to build the sensitive word tree. Finally, it could search and filter the sensitive words in the text content on the basis of the construction of the sensitive word tree structure and the minimum matching rule. Through analysis, the time complexity of constructing sensitive word tree algorithm is O(n×len), and detecting and filtering sensitive word algorithm is O(L). The experimental results show that the precision rate of the algorithm is 100%, and the recall rate is about 87%~100%.

Foundation Support

国家自然科学基金资助项目(61804032)
院士基金资助项目(ZHD201806)

Publish Information

DOI: 10.19734/j.issn.1001-3695.2020.09.0240
Publish at: Application Research of Computers Printed Article, Vol. 38, 2021 No. 6
Section: Algorithm Research & Explore
Pages: 1678-1682,1688
Serial Number: 1001-3695(2021)06-014-1678-05

Publish History

[2021-06-05] Printed Article

Cite This Article

吴珊, 李英祥, 徐鸿雁, 等. 基于改进的Trie树和DFA的敏感词过滤算法 [J]. 计算机应用研究, 2021, 38 (6): 1678-1682,1688. (Wu Shan, Li Yingxiang, Xu Hongyan, et al. Sensitive word filtering algorithm based on improved Trie tree and DFA [J]. Application Research of Computers, 2021, 38 (6): 1678-1682,1688. )

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  • Application Research of Computers Monthly Journal
  • Journal ID ISSN 1001-3695
    CN  51-1196/TP

Application Research of Computers, founded in 1984, is an academic journal of computing technology sponsored by Sichuan Institute of Computer Sciences under the Science and Technology Department of Sichuan Province.

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