Registration device, server device, searchable encryption system, and searchable encryption method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 28, 2023
Grant Date -
Dec 31, 2020
app pub date -
Sep 15, 2020
filing date -
May 8, 2018
priority date (Note) -
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Abstract
A registration device (200) generates an encryption keyword by encrypting a keyword with a registration key, generates an index including the encryption keyword and identification information which identifies a corresponding ciphertext, generates a conversion key from the registration key and a search key, and registers a plurality of ciphertexts, the index, and the conversion key in a server device (400). A search device (300) generates a search query by encrypting a keyword, and transmits the search query to the server device (400). The server device (400) generates a re-encryption keyword by re-encrypting the search query with the registered conversion key, searches the registered index with the re-encryption keyword, acquires, from the index, the identification information if the encryption keyword is obtained as a search result, extracts a ciphertext identified by the identification information from the registered plurality of ciphertexts, and transmits the extracted ciphertext to the search device (300).
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