Patent ID: 11902415
Assignee: TOHOKU UNIVERSITY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A secure computing method comprising:
executing secure computing on encrypted data obtained by encrypting plaintext represented in a prescribed expression format for stochastic computing in a homomorphic encryption scheme,
wherein the secure computing includes a process of acquiring a sum and a process of acquiring a product, and
wherein the step of executing the secure computing:
determines a value of each digit of a bit string representing the sum as one of a value of a corresponding digit of a bit string that represents first encrypted data and is represented in the expression format and a value of a corresponding digit of a bit string that represents second encrypted data and is represented in the expression format in the process of acquiring the sum that is a sum of the first encrypted data of the encrypted data and the second encrypted data of the encrypted data; and
acquires a value of each digit of a bit string representing the product using a logical operation according to the expression format in the process of acquiring the product that is a product of the first encrypted data of the encrypted data and the second encrypted data of the encrypted data, the logical operation being a two-input logical operation in which a value of a corresponding digit of the bit string that represents the first encrypted data and is represented in the expression format and a value of a corresponding digit of the bit string that represents the second encrypted data and is represented in the expression format are input.