US 2019/0199510 A1 · PROCESSING APPARATUS, PROCESSING METHOD, STORAGE MEDIUM, AND ENCRYPTION PROCESSING SYSTEM

Abstract

A processing apparatus includes at least one processor configured to function as: an input unit that receives encrypted data based on homomorphic encryption as an input; and a process execution unit that executes a predetermined process by using the encrypted data while maintaining a secret state by encryption and includes one or more processing units. At least one of the processing units is a multiplication corresponding processing unit for executing a calculation in a ciphertext space corresponding to a processing of multiplying plaintext data by a predetermined multiplier. The multiplication corresponding processing unit executes a calculation in the ciphertext space corresponding to a calculation of multiplying the plaintext data by an adjustment multiplication value on first encrypted data input from a preceding stage and outputs resulting data. The adjustment multiplication value is obtained by multiplying the predetermined multiplier by a predetermined adjustment value for the multiplication corresponding processing unit and by performing an integer processing.

Claims11

Dependent claims

A processing apparatus comprising

at least one processor configured to function as:
an input unit that receives encrypted data based on homomorphic encryption as an input;
and
a process execution unit that executes a predetermined process by using the encrypted data while maintaining a secret state by encryption and includes one or more processing units, wherein
at least one of the processing units is a multiplication corresponding processing unit for executing a calculation in a ciphertext space corresponding to a processing of multiplying plaintext data by a predetermined multiplier, and
the multiplication corresponding processing unit executes a calculation in the ciphertext space corresponding to a calculation of multiplying the plaintext data by an adjustment multiplication value on first encrypted data input from a preceding stage and outputs resulting data, the adjustment multiplication value being obtained by multiplying the predetermined multiplier by a predetermined adjustment value for the multiplication corresponding processing unit and by performing an integer processing.

3 more elements

An encryption processing system comprising:

a processing apparatus for executing a predetermined process by using encrypted data based on homomorphic encryption as an input while maintaining a secret state by encryption;
and
a result generation apparatus for executing a process for generating a result corresponding to first plaintext data by using a processing result by the processing apparatus as an input, wherein
the processing apparatus includes at least one processor configured to function as
an input unit that receives the encrypted data, and
a process execution unit that executes the predetermined process by using the encrypted data and includes one or more processing units at least one of which is a multiplication corresponding processing unit for executing a calculation in a ciphertext space corresponding to a processing of multiplying the first plaintext data by a predetermined multiplier, the multiplication corresponding processing unit executing a calculation in the ciphertext space corresponding to a calculation of multiplying the first plaintext data by an adjustment multiplication value on first encrypted data input from a preceding stage and outputs resulting data, the adjustment multiplication value being obtained by multiplying the predetermined multiplier by a predetermined adjustment value for the multiplication corresponding processing unit and by performing an integer processing, and
the result generation apparatus includes at least one processor configured to function as
a processing result reception unit that receives the processing result by the process execution unit of the processing apparatus,
a decryption unit that decrypts the processing result to obtain second plaintext data, and
an adjustment removal processing unit that generates the result by executing a process of removing adjustment on the second plaintext data based on the predetermined adjustment value for the multiplication corresponding processing unit of the process execution unit.

7 more elements

Dependencies are inferred from the claim text.

Processing apparatus, processing method, storage medium, and encryption processing system

Life of this patent

Processing apparatus, processing method, storage medium, and encryption processing system

Life of this patent

Abstract

Claims11