Samsung Sds Co., Ltd.

Lotte Confectionery Co., Ltd.

Jang Hyuk Ahn

Eun Kyung Kim

Young Hyun Kim

Hyo Jin Yoon

Chang Hoon Lee

Jung Hoon Sohn

Duk Jae Moon

Jin Hyuck Jeong

Ki Young Kim

Ik Boo Kwon

Ji Hoon Kwon

Eui Sun Lee

Young Youll Chang

Dong Ghu Seon

Ji Sang Yoon

Young Hwa Lee

A method for performing an operation according to one embodiment includes performing a homomorphic operation using one or more ciphertexts that are homomorphically encrypted based on an encryption key, determining a count value for a ciphertext generated through the homomorphic operation based on count values for each of the one or more ciphertexts, requesting a key management apparatus, which holds the encryption key and a decryption key corresponding to the encryption key, to re-encrypt the generated ciphertext based on the determined count value, acquiring, from the key management apparatus, a ciphertext generated by re-encrypting the generated ciphertext through decryption based on the decryption key and encryption based on the encryption key; and determining a count value for the acquired ciphertext to be a preset initial value.

Method and apparatus for performing operation using encrypted data

Process of manufacturing gum having various colors and patterns

Growing community of inventors

Seoul, South Korea

Jang Hyuk Ahn