Research on Multi-keyword Encrypted Search with Support for Semantic Extension
Most of the existing multi-keyword search studies focus on supporting the exact matching of keywords,a multi-keyword encrypted scheme is proposed to supports semantic extension query,and based on the information content calculation method and considering the relationship between keywords and documents,TF-IDF technology is introduced to realize semantic expansion;the index structure of balanced binary tree is adopted,and the index vector and semantic extension query vector are encrypted by the secure k-nearest neighbor algorithm to ensure that the accurate relevance score is calculated and the multi-keyword sorting search is realized.By analyzing the security of the confidentiality of indexes and trapgates,the irrelevance of queries,it is shown that the implemented retrieval scheme is safe and can prevent insider threats.
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