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Cloud Computing enables users to have access to shared resources somewhere on the Internet. At least, some storage capacities can easily be envisaged. This brings many sensitive information in the Cloud where they should stay, to preserve their confidentiality, encrypted. To look at their content remotely (and without decrypting them), some specific procedures have been developed. Searchable encryption builds up an index for each keyword of interest. This way, a user can search over his encrypted data for such a keyword and retrieve the files containing it.
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