Inventor
NAGANUMA KEN
JP15 patents
⚠️ This page may combine multiple inventors who share the name “NAGANUMA KEN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
8 patentsUS10489604B2Nov 26, 2019
Searchable encryption processing system and searchable encryption processing method
HITACHI LTD38 citations93
US11018876B2May 25, 2021
Signature verification system, signature verification method, and storage medium
HITACHI LTD2 citations71
US12321470B2Jun 3, 2025
Data management system, data management method, and non-transitory computer readable medium
HITACHI LTD2 citations66
US11971998B2Apr 30, 2024
Data comparison device, data comparison system, and data comparison method
HITACHI LTD0 citations51
US11295635B2Apr 5, 2022
Data processing system and data processing method
HITACHI LTD0 citations51
US11184163B2Nov 23, 2021
Value comparison server, value comparison encryption system, and value comparison method
HITACHI LTD0 citations51
US11120143B2Sep 14, 2021
Data analysis server, data analysis system, and data analysis method
HITACHI LTD0 citations51
US12386727B2Aug 12, 2025
Method and apparatus for bug bounty system for blockchain
HITACHI LTD0 citations45
NAGANUMA KEN
3 patentsUS9432197B2Aug 30, 2016
Wireless communications device and authentication processing method
NAGANUMA KEN10 citations82
US9276734B2Mar 1, 2016
Confidential computation system, confidential computation method, and confidential computation program
NAGANUMA KEN3 citations70
US8165601B2Apr 24, 2012
Positional information system
NAGANUMA KEN3 citations60