Ciphertext data storage and retrieval method for mobile cloud computing

The invention provides a ciphertext data storage and retrieval method for mobile cloud computing. The method comprises the following steps of preprocessing text by a data owner, extracting keywordsand word frequency-inverse document frequency (TF-IDF) corresponding to the keywords, and generating an index; generating a trap door locally when the text information privacy of the data user is notleaked; and using an optimized search algorithm on a cloud server, and returning the most associated first few encrypted files. The invention provides an encrypted text search scheme more suitable formobile equipment. The required text can be efficiently searched, on the premise of ensuring accurate text search, , the time consumption of information in the network transmission process can be effectively reduced compared with a conventional method. The optimized search algorithm is used, and the search time consumed on a cloud server is effectively shortened. The invention also supports the search of multiple keywords. 本发