US 12,216,787 B2
Searchable encryption system, searchable encryption method, and non-transitory computer-readable recording medium
Takato Hirano, Tokyo (JP); Yutaka Kawai, Tokyo (JP); Yoshihiro Koseki, Tokyo (JP); and Satoshi Yasuda, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
Filed on May 11, 2022, as Appl. No. 17/742,179.
Application 17/742,179 is a continuation of application No. PCT/JP2020/000845, filed on Jan. 14, 2020.
Prior Publication US 2022/0277100 A1, Sep. 1, 2022
Int. Cl. G06F 21/62 (2013.01)
CPC G06F 21/6227 (2013.01) 19 Claims
OG exemplary drawing
 
1. A searchable encryption system comprising:
a registration device including:
processing circuitry
to store a registration keyword, authorized-person attribute information indicating an attribute to be owned by an authorized person who has an authority to search for the registration keyword, and an index disclosure key to encrypt a registration keyword index corresponding to the registration keyword;
to generate the registration keyword index by using the registration keyword, the authorized-person attribute information, a user key function to generate a user key having incorporated therein searcher attribute information indicating an attribute that a searcher who searches for the registration keyword has, a search query function to generate a search query having the user key incorporated therein, the search query corresponding to a search keyword for the searcher to search for the registration keyword, and an index query function to generate an index query having the search query incorporated therein, the index query being for searching for the registration keyword index; and
to generate an encrypted index by encrypting the registration keyword index by using the index disclosure key.