Title:
ENCODED DATA ANALYSIS DEVICE, ENCODED DATA ANALYSIS METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2021/144840
Kind Code:
A1
Abstract:
Provided is an encoded data analysis device capable of performing analysis while keeping encoded data secret. [x] indicates encoded data of x. The present invention includes: a sorting unit that sorts an encoded data set group by [time information] and then by [user ID], the encoded data set group including a plurality of combinations of encoded data sets, each consisting of a [location ID], a [user ID], and [time information] obtained by encoding each piece of data to be analyzed in a set of data to be analyzed, which consists of a location ID, a user ID, and time information indicating a prescribed time during which a prescribed user was at a prescribed location; an encoding unit that sets, as the number of hops, the number of transitions of a preset location, and generates a [flow] by cutting out and encoding the [location IDs] every set number of hops in the sorted order; and an equality determination unit that determines whether adjacent [user IDs] are equal, and if not equal, replaces the corresponding [flow] with a [prescribed value that indicates invalid].
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Inventors:
KIKUCHI RYO (JP)
TAKAHASHI GEN (JP)
HAMADA KOKI (JP)
TAKAHASHI GEN (JP)
HAMADA KOKI (JP)
Application Number:
PCT/JP2020/000861
Publication Date:
July 22, 2021
Filing Date:
January 14, 2020
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G09C1/00; G06F21/60
Domestic Patent References:
| WO2015107951A1 | 2015-07-23 |
Foreign References:
| JP2019158608A | 2019-09-19 |
Other References:
KIKUCHI, RYO ET AL.: "Let's Try Lateral Human Mobility Analysis with Secure Computation", 2020 SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY, 21 January 2020 (2020-01-21), pages 1 - 8
Attorney, Agent or Firm:
NAKAO, Naoki et al. (JP)
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