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Multi-user multi-keyword ranked search scheme in arbitrary language is anovel multi-keyword rank searchable encryption (MRSE) framework based onPaillier Cryptosystem with Threshold Decryption (PCTD). Compared to previousMRSE schemes constructed based on the k-nearest neighbor searcha-ble encryption(KNN-SE) algorithm, it can mitigate some draw-backs and achieve betterperformance in terms of functionality and efficiency. Additionally, it does notrequire a predefined keyword set and support keywords in arbitrary languages.However, due to the pattern of exact matching of keywords in the new MRSEscheme, multilingual search is limited to each language and cannot be searchedacross languages. In this pa-per, we propose a cross-lingual multi-keyword ranksearch (CLRSE) scheme which eliminates the barrier of languages and achievessemantic extension with using the Open Multilingual Wordnet. Our CLRSE schemealso realizes intelligent and per-sonalized search through flexible keyword andlanguage prefer-ence settings. We evaluate the performance of our scheme interms of security, functionality, precision and efficiency, via extensiveexperiments.

Achieving Secure and Efficient Cloud Search Services: Cross-Lingual Multi-Keyword Rank Search over Encrypted Cloud Data