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1. 发明授权

US10936757B2 Registration destination determination device, searchable encryption system, destination determination method, and computer readable medium 有权
公开(公告)号：US10936757B2
公开(公告)日：2021-03-02
申请号：US16091690
申请日：2016-05-27
申请人： MITSUBISHI ELECTRIC CORPORATION
发明人： Takashi Ito , Nori Matsuda , Mitsuhiro Hattori , Yoichi Shibata , Takumi Mori , Takato Hirano , Yoshihiro Koseki
IPC分类号： H04L29/06 , G06F21/75 , G06F21/62 , H04L9/30 , G06F16/00 , H04L9/00 , G06F16/24 , G06F17/18 , G06F21/60
摘要： A registration destination determination device (50) determines which data management device, among a plurality of data management devices (20A, 20B), is to manage registration data, such that, with a data type constituting the registration data as a target type, an appearance frequency distribution of values set for the target type of the registration data managed by each of the plurality of data management devices (20A, 20B) is different from an appearance frequency distribution of values set for the target type of the registration data managed by the whole of the plurality of data management devices (20A, 20B).

2. 发明授权

US11106740B2 Search device, search system, search method, and computer readable medium 有权
公开(公告)号：US11106740B2
公开(公告)日：2021-08-31
申请号：US16490445
申请日：2017-04-25
申请人： MITSUBISHI ELECTRIC CORPORATION
发明人： Yoichi Shibata , Yoshihiro Koseki
IPC分类号： G06F16/903 , G06F16/9032 , G06F21/60
摘要： A search device (300) transmits a search condition to a management device (400) that manages a numerical value which is a number sequence of one or more digits, based on a digit-by-digit correspondence between a number of each digit of the numerical value and a digit representation which is a symbol representing a digit. A grouping unit performs grouping on a plurality of search-target numerical values to be searched for, each of which is a number sequence of one or more digits, on a basis of commonality of the number of digits and commonality of a number sequence from a most significant digit, so as to generate one or more numerical value groups. A search condition generation unit generates, for each numerical value group, a search condition element by establishing a correspondence between a number of each digit of a sequence common range, which is a range of a number sequence common to search-target numerical values included in each numerical value group, and the digit representation of each digit of the sequence common range, and generates the search condition by integrating the search condition element of each numerical value group. A transmission unit (305) transmits the search condition generated by the search condition generation unit to the management device (400).

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