SECURE EQUI-JOIN APPARATUS, SECURE EQUI-JOIN METHOD, AND PROGRAM
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United States of America Patent
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Issued Date -
Aug 29, 2024
app pub date -
Jul 2, 2021
filing date -
Jul 2, 2021
priority date (Note) -
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Abstract
A secret equi-join device uses as inputs a first concealed table that is concealed information of a first table having a plurality of keys and a second concealed table that is concealed information of a second table having a plurality of keys, obtains a first concealed additional table that is concealed information of a first additional table which is obtained by adding a subkey column to the first table, obtains by secure computation a second concealed additional table that is concealed information of a second additional table which is obtained by adding a subkey column further to a third table obtained by copying each record in the second table a plurality of times and adding the copied records, and obtains a concealed joined table that is concealed information of a joined table which is obtained by equi-joining the first additional table and the second additional table.
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