Patent ID: 9405787
Filing Date: 2016-08-02
CPC Classification: G06F,H04L

Claim Text:
1. A distributed anonymization device, comprising a processor configured to: store a user identifier and information on a user in association with one another; separate the stored user identifier and a dummy identifier which is an identifier different from the user identifier, in a plurality of inputted identifiers, into groups; transmit to another device; information on the identifiers included in the separated groups; determine, on each of the groups, whether or not proportion of identifiers existing in both the above mentioned distributed anonymization device and the other device satisfies a predetermined anonymity index; and set, as a dummy identifier, the identifier that is different from the stored user identifier in the plurality of inputted identifiers, wherein the information on the identifiers included in the separated groups is separation information indicating content of the identifiers in the separated groups.