Patents by Inventor Duk-Jae Moon

Duk-Jae Moon has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11329798
    Abstract: An apparatus for set intersection operation according to an embodiment includes a ciphertext acquisition unit configured to acquire a ciphertext for a first vector corresponding to a first subset of a universal set including a plurality of elements from an encryption apparatus, a transform unit configured to generate a second vector corresponding to a second subset of the universal set, a computation unit configured to generate a ciphertext for a third vector corresponding to an intersection of the first subset and the second subset, based on the ciphertext for the first vector and the second vector, and a ciphertext providing unit configured to provides the ciphertext for the third vector to the encryption apparatus.
    Type: Grant
    Filed: October 26, 2020
    Date of Patent: May 10, 2022
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Jin Hyuck Jeong, Joo Hee Lee, Eun Kyung Kim, Kyu Young Choi, Duk Jae Moon, Hyo Jin Yoon
  • Patent number: 11277257
    Abstract: 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.
    Type: Grant
    Filed: May 27, 2020
    Date of Patent: March 15, 2022
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Eun Kyung Kim, Duk Jae Moon, Hyo Jin Yoon, Jung Hoon Sohn, Jang Hyuk Ahn, Jin Hyuck Jeong, Ji Hoon Kwon, Young Hyun Kim
  • Publication number: 20210328765
    Abstract: A method for encryption according to an embodiment includes generating a ciphertext for a secret key that is an integer vector by using an integer-based first homomorphic encryption algorithm, generating a key stream that is the integer vector from a nonce and the secret key by using a key stream generator, encoding the key stream by using a message encoding function of the first homomorphic encryption algorithm, encoding a message that is a real vector by using a message encoding function of a real number-based second homomorphic encryption algorithm, generating a ciphertext for the message by using a result of the encoding of the key stream and a result of the encoding of the message, and transmitting the nonce, the ciphertext for the secret key, and the ciphertext for the message to an apparatus for converting a ciphertext.
    Type: Application
    Filed: October 27, 2020
    Publication date: October 21, 2021
    Inventors: Joo Hee LEE, Duk Jae MOON, Hyo Jin YOON, Ji Hoon CHO, Eun Kyung KIM, Seong Kwang KIM, Joo Young LEE, Jin Cheol HA, Won Seok CHOI
  • Publication number: 20210328764
    Abstract: A method for data analysis according to an embodiment includes acquiring, from a client device, a ciphertext for a precomputation result generated by applying some of a plurality of operations for performing an analysis algorithm based on target data to the target data, and generating an encrypted computation result for remaining operations of the plurality of operations by using the ciphertext.
    Type: Application
    Filed: May 27, 2020
    Publication date: October 21, 2021
    Inventors: Eun Kyung KIM, Young Hyun KIM, Jin Hyuck JEONG, Duk Jae MOON, Hyo Jin YOON, Jung Hoon SOHN, Ki Hyo MOON, Seung Hyun KANG, Seung Ro JOO
  • Publication number: 20210297232
    Abstract: 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.
    Type: Application
    Filed: May 27, 2020
    Publication date: September 23, 2021
    Inventors: Eun Kyung KIM, Duk Jae MOON, Hyo Jin YOON, Jung Hoon SOHN, Jang Hyuk AHN, Jin Hyuck JEONG, Ji Hoon KWON, Young Hyun KIM
  • Patent number: 11102241
    Abstract: An apparatus and method for performing an operation which are secure against side-channel attack are provided. According to one embodiment of the present disclosure, the apparatus includes a first outputter configured to output a first output value corresponding to a seed value using a first parameter candidate value set, a second outputter configured to output a second output value using a second parameter candidate value set wherein the second output value corresponds to the seed value and is capable of being generated using the first output value, a third outputter configured to output a third output value using the seed value and the first output value, and a fourth outputter configured to output a fourth output value using the second output value and the third output value, wherein the fourth output value is capable of being generated using the seed value.
    Type: Grant
    Filed: October 15, 2018
    Date of Patent: August 24, 2021
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Kyu-Young Choi, Duk-Jae Moon, Hyo-Jin Yoon, Ji-Hoon Cho
  • Patent number: 11101994
    Abstract: A method of provisioning key information and a device using the method are provided. The method of provisioning key information according to one embodiment of the present disclosure includes generating key information for encryption and decryption from seed information using a key information generation algorithm and deleting code that corresponds to the key information generation algorithm from the device based on the generation of the key information.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: August 24, 2021
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Hyo-Jin Yoon, Kyu-Young Choi, Duk-Jae Moon, Ji-Hoon Cho
  • Publication number: 20210203474
    Abstract: A method for performing an operation according to an embodiment includes assigning an error value to encrypted data; and performing a homomorphic operation for an approximation function, which is obtained by approximating a target function, by using, as an input value, the encrypted data to which the error value is assigned.
    Type: Application
    Filed: May 27, 2020
    Publication date: July 1, 2021
    Inventors: Eun Kyung KIM, Young Hyun KIM, Hyo Jin YOON, Duk Jae MOON, Jung Hoon SOHN, Jin Hyuck JEONG, Seung Ro JOO, Seung Hyun KANG, Ki Hyo MOON
  • Publication number: 20210194671
    Abstract: An apparatus for set intersection operation according to an embodiment includes a ciphertext acquisition unit configured to acquire a ciphertext for a first vector corresponding to a first subset of a universal set including a plurality of elements from an encryption apparatus, a transform unit configured to generate a second vector corresponding to a second subset of the universal set, a computation unit configured to generate a ciphertext for a third vector corresponding to an intersection of the first subset and the second subset, based on the ciphertext for the first vector and the second vector, and a ciphertext providing unit configured to provides the ciphertext for the third vector to the encryption apparatus.
    Type: Application
    Filed: October 26, 2020
    Publication date: June 24, 2021
    Inventors: Jin Hyuck JEONG, Joo Hee LEE, Eun Kyung KIM, Kyu Young CHOI, Duk Jae MOON, Hyo Jin YOON
  • Patent number: 11042954
    Abstract: A system and method for communication between devices are provided. According to the embodiments of the present disclosure, it is possible to easily authenticate a counterpart device using a one-time key HN(T) for a D2D communication between a first device and a second device, without using a separate secure channel (e.g., secure sockets layer (SSL), transport layer security (TLS), or the like) in an environment where it is difficult to synchronize the first device with the second device without intervention of a server.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: June 22, 2021
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Hyo-Jin Yoon, Kyu-Young Choi, Duk-Jae Moon, Ki-Young Kim, Jang-Hyuk Ahn, Ji-Hoon Cho
  • Patent number: 11012424
    Abstract: An authentication system and method are provided. According to the embodiments of the present disclosure, it is possible to provide a secure authentication service capable of maintaining personal privacy by enabling authentication while preventing personal information used for personal authentication, such as biometric information, from being exposed in the authentication process.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: May 18, 2021
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Kyu-Young Choi, Ji-Hoon Cho, Hyo-Jin Yoon, Duk-Jae Moon
  • Patent number: 10999056
    Abstract: An apparatus and method for performing operation being secure against side channel attack are provided. The apparatus and method generate values equal to values obtained through an exponentiation operation or a scalar multiplication operation of a point using values extracted from previously generated parameter candidate value sets and an operation secure against side-channel attack, thereby improving security against side-channel attack without degrading performance.
    Type: Grant
    Filed: January 4, 2018
    Date of Patent: May 4, 2021
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Kyu-Young Choi, Duk-Jae Moon, Hyo-Jin Yoon, Ji-Hoon Cho
  • Publication number: 20210126768
    Abstract: An apparatus for encryption according to an embodiment of the present disclosure comprises a classifier configured to classify each data included in an original data set into one of encryption target data and non-encryption target data on the basis of at least one of determination on whether or not an operation to be applied to each data included in the original data set for an analysis of the original data set is a preset operation and determination on whether or not each data included in the original data set is sensitive information; and an encryptor configured to encrypt the encryption target data among the data included in the original data set using a homomorphic encryption algorithm.
    Type: Application
    Filed: October 28, 2019
    Publication date: April 29, 2021
    Inventors: Eun-Kyung Kim, Hyo-Jin Yoon, Duk-Jae Moon, Min-Woo Jeong, Jung-Hoon Sohn, Young-Hyun Kim, Hun-Hee Yu, Ji-Hoon Kwon
  • Publication number: 20210126770
    Abstract: A method according to one embodiment includes generating one or more key tables based on a first seed value; generating one or more secret values from a tweak value based on the one or more key tables; and performing encryption or decryption using the one or more secret values. An apparatus according to one embodiment includes a key table generator configured to generate one or more key tables based on a first seed value, a secret value generator configured to generate one or more secret values from a tweak value based on the one or more key tables, and an encryptor/decryptor configured to perform encryption or decryption using the one or more secret values.
    Type: Application
    Filed: October 26, 2019
    Publication date: April 29, 2021
    Inventors: Duk-Jae Moon, Ji-hoon Kwon, Joo-Young Lee
  • Publication number: 20210105134
    Abstract: A method for performing a matrix multiplication operation being secure against side-channel attacks according to one embodiment, which is performed by a computing device comprising one or more processors and a memory storing one or more programs to be executed by the one or more processors, includes shuffling an order of execution of multiplication operations between elements of a first matrix and elements of a second matrix for a matrix multiplication operation between the first matrix and the second matrix; and performing the matrix multiplication operation based on the shuffled order of execution.
    Type: Application
    Filed: October 26, 2019
    Publication date: April 8, 2021
    Inventors: Kyu-Young Choi, Duk-Jae Moon, Ji-Hoon Cho, Dong Guk HAN, Bo Yeon SIM, Jae Geun MOON, Ae Sun PARK
  • Patent number: 10965454
    Abstract: Disclosed are an apparatus and method for public key encryption using a white-box cipher algorithm. An apparatus for public key encryption using a white-box cipher algorithm includes a key table generator configured to generate at least one key table from a cipher key, a hidden-key table generator configured to convert the at least one key table into at least one hidden-key table, and an encryption algorithm generator configured to generate a white-box implemented encryption algorithm by using the at least one hidden-key table and an inverse operation of the conversion and provide the generated encryption algorithm as a public key for encryption.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: March 30, 2021
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Duk-Jae Moon, Kyu-Young Choi, Ji-Hoon Cho
  • Patent number: 10951402
    Abstract: Disclosed are an apparatus and method for encryption. The encryption apparatus includes a key table generator configured to generate at least one encryption key table from random values obtained from a seed value and generate at least one decryption key table from the at least one encryption key table; an algorithm generator configured to generate an encryption algorithm having a Misty structure that has a round function to which the at least one encryption key table is applied and a decryption algorithm having a Misty structure that has a round function to which the at least one decryption key table is applied; an encryptor configured to encrypt plaintext data with the encryption algorithm; and a decryptor configured to decrypt encrypted data with the decryption algorithm.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: March 16, 2021
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Duk-Jae Moon, Kyu-Young Choi, Ji-Hoon Cho
  • Patent number: 10903975
    Abstract: An apparatus and method for performing an operation which are secure against side-channel attack are provided. According to one embodiment of the present disclosure, the apparatus includes a first extractor configured to extract one or more first parameter candidate values corresponding to a seed value from a first parameter candidate value set, a first outputter configured to output a first output values using the extracted first parameter candidate values, a second extractor configured to extract one or more second parameter candidate values corresponding to the seed value from a second parameter candidate value set, and a second outputter configured to output a second output value using the extracted second parameter candidate values wherein the second output value is capable of being generated using the first output value.
    Type: Grant
    Filed: August 13, 2018
    Date of Patent: January 26, 2021
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Kyu-Young Choi, Duk-Jae Moon, Hyo-Jin Yoon, Ji-Hoon Cho
  • Patent number: 10812260
    Abstract: An apparatus and method for performing operation being secure against side channel attack are provided. The apparatus and method generate values equal to values obtained through an exponentiation operation or a scalar multiplication operation of a point using values extracted from previously generated parameter candidate value sets and an operation secure against side-channel attack, thereby improving security against side-channel attack without degrading performance.
    Type: Grant
    Filed: January 5, 2018
    Date of Patent: October 20, 2020
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Kyu-Young Choi, Duk-Jae Moon, Hyo-Jin Yoon, Ji-Hoon Cho
  • Patent number: 10721059
    Abstract: Disclosed are an apparatus and method for data encryption and an apparatus and method for data decryption. The data encryption apparatus includes a key exchanger configured to generate a session key using a key exchange protocol, a cipher key generator configured to generate at least one of a cipher key and a key table from the session key, and an encryptor configured to encrypt data with the at least one of the cipher key and the key table generated from the session key.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: July 21, 2020
    Assignee: SAMSUNG SDS CO., LTD.
    Inventors: Kyu-Young Choi, Ji-Hoon Cho, Duk-Jae Moon