Patent ID: 11902418
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A search operation device comprising:
processing circuitry configured to:
accept a search keyword and a user key; and
generate a search query by using the search keyword and a user tag key included in the user key, wherein
the user tag key has a plurality of flag values based on a plurality of attribute values which identify a plurality of attributes of a user and one or more tag attribute keys based on one or more aggregate values generated by aggregating the plurality of attribute values, and
the processing circuitry further configured to:
generate a search-purpose aggregate flag indicating one or more aggregate values each configured of one or more flag values, by aggregating the plurality of flag values included in the user tag key,
generate, by using the search-purpose aggregate flag, search position information which identifies one or more attribute elements for use in searching among a plurality of attribute elements included in an encrypted tag registered together with ciphertext data in a database, and
generate the search query by using the search keyword, the one or more tag attribute keys included in the user tag key, and the search position information.