Electronic apparatus and method for verifying encrypted data

An electronic apparatus comprising:

• a communication interface;
• and
• a processor,
• wherein the processor is configured to:
• control the communication interface to transmit encrypted quotient polynomial rings to an external device, receive from the external device a result value calculated by performing an operation process for at least one layer on the basis of the encrypted quotient polynomial rings, transmit a random value to the external device, and receive claim data obtained by performing the operation process in a reverse order on the basis of the random value from the external device;
• and
• verify the received result value on the basis of a value of the quotient polynomial rings corresponding to the random value and the received claim data.

A non-transitory computer-readable storage medium storing a program for performing a verification method of an electronic apparatus, wherein the verification method comprises:

• transmitting encrypted quotient polynomial rings to an external device;
• receiving, from the external device, a result value calculated through an operation process for at least one layer on the basis of the transmitted encrypted quotient polynomial rings;
• transmitting a random value to the external device and receiving claim data obtained by performing the operation process in a reverse order on the basis of the random value from the external device;
• and
• verifying the received result value on the basis of a value of the quotient polynomial rings corresponding to the random value and the received claim data.