Samsung Electronics Co., Ltd.

Whan Ghang

Dong-hoon Yoo

Jieun Eom

Rakyong Choi

Andrey Kim

YongWoo Lee

Yongwoo Lee

Maksim Deriabin

Deriabin Maksim

An encryption key generating method and apparatus based on homomorphic encryption, and a ciphertext operation method and apparatus using the generated encrypt key are disclosed. The method of generating an encryption key for performing encryption based on homomorphic encryption includes receiving data, generating a first encryption key and a second encryption key used for encrypting the data based on a secret key, and transmitting the first and second encryption keys.

Encryption key generating method, apparatus, ciphertext operation method and apparatus using the generated encryption key

Disclosed is a method and apparatus for modulus refresh, where the method for modulus refresh of a ciphertext in homomorphic encryption includes receiving a first ciphertext corresponding to a first modulus, generating a second ciphertext by performing a blind rotation on the first ciphertext, and generating a target ciphertext corresponding to a second modulus greater than the first modulus based on the first ciphertext and the second ciphertext.

Method and apparatus for modulus refresh in homomorphic encryption

Growing community of inventors

Suwon-si, South Korea

Whan Ghang