HOMOMORPHIC INFERENCE DEVICE, HOMOMORPHIC INFERENCE METHOD, COMPUTER READABLE MEDIUM, AND PRIVACY-PRESERVING INFORMATION PROCESSING SYSTEM

摘要

A range determination unit (412) takes as input an input ciphertext C_i resulting from encrypting input data, determines whether a value obtained from the input data is within a reference range, and generates a range ciphertext a_j depending on a determined result. A result generation unit (413) performs a homomorphic operation on the range ciphertext a_j generated by the range determination unit (412), so as to generate a result ciphertext D of a result of performing inference including a non-polynomial operation on the input data. An output unit (414) outputs the result ciphertext D.