Server device for processing homomorphic ciphertext and method thereof

A server device is disclosed. The server device comprises: a communication device that communicates with a first electronic device; a memory for storing data received from the first electronic device; and a processor. The processor receives, from the first electronic device, a homomorphic ciphertext...

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Bibliographic Details
Main Author SHIN JUN BUM
Format Patent
LanguageEnglish
Korean
Published 11.11.2022
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:A server device is disclosed. The server device comprises: a communication device that communicates with a first electronic device; a memory for storing data received from the first electronic device; and a processor. The processor receives, from the first electronic device, a homomorphic ciphertext having homomorphically encrypted user information and digital signature information for the homomorphic ciphertext, performs digital signature verification for the homomorphic ciphertext based on the received digital signature information, restores the user information if the digital signature verification for the homomorphic ciphertext is checked, and transmits the restored user information to the first electronic device. 서버 장치가 개시된다. 본 서버 장치는, 제1 전자 장치와 통신을 수행하는 통신 장치, 제1 전자 장치로부터 수신한 데이터를 저장하는 메모리 및 프로세서를 포함하며, 프로세서는, 동형 암호화된 사용자 정보를 갖는 동형 암호문과 동형 암호문에 대한 전자서명 정보를 제1 전자 장치로부터 수신하고, 수신된 전자서명 정보에 기초하여 동형 암호문에 대한 전자서명 검증을 수행하고, 동형 암호문에 대한 전자서명 검증이 확인되면, 사용자 정보를 복원하고, 복원된 사용자 정보를 제1 전자 장치에 전송할 수 있다.
Bibliography:Application Number: KR20220072326